---
product_id: 511357705
title: "INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal"
brand: "intoo"
price: "23336 kr"
currency: ISK
in_stock: true
url: https://www.desertcart.is/products/511357705-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry
store_origin: IS
region: Iceland
---

# Golden Ratio tip for ultra-smooth drilling 21 precision sizes for every project 5% cobalt for max durability INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal

**Brand:** intoo
**Price:** 23336 kr
**Availability:** ✅ In Stock

## Summary

> 🔩 Drill smarter, last longer — the pro’s choice for hard metal mastery!

## Quick Answers

- **What is this?** INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal by intoo
- **How much does it cost?** 23336 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/511357705-intoo-hss-cobalt-drill-bits-set-21pcs-triangle-shank-industry)

## Best For

- intoo enthusiasts

## Why This Product

- Trusted intoo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Premium Cobalt Alloy:** 5% cobalt-infused HSS M35 material boosts wear resistance and toughness for heavy-duty industrial use.
- • **Complete 21-Piece Set:** From micro 1/16" to robust 3/8", every size you need in one sleek triangle-shank kit.
- • **Ergonomic Triangle Shank:** Secure grip and reduced slippage for precision drilling under demanding conditions.
- • **Durable Metal Storage Box:** Keep your bits organized and protected—ready to impress on any job site or workshop.
- • **Golden Ratio Tip Technology:** Patented 135° tip engineered for cleaner holes and 3x longer life on stainless steel and hard metals.

## Overview

The INTOO 21-piece cobalt drill bit set features a patented Golden Ratio 135° tip and 5% cobalt HSS M35 material, delivering superior durability and precision for drilling stainless steel and hard metals. With a versatile range of sizes and a secure triangle shank design, this set ensures clean, smooth holes and up to three times longer bit life, all housed in a rugged metal storage box for professional-grade convenience.

## Description

INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal

## Features

- SPECIFICATIONS:21PCS COBALT DRILL BIT SET： 1/16,5/64,3/32,7/64,1/8,9/64,5/32,11/64,3/16,13/64,7/32,15/64,1/4,17/64,9/32,19/64,5/16,21/64,11/32,32/64,3/8 with triangle shank.
- GOLDEN RATIO TIP:From size 5/32" with patented "Golden Ratio" Tip,which especially designed for heavy duty purpose, effect clean&smooth holes on hard metal like stainless steel,and moreover, at least 3 times longer life.
- COBALT 5% MATERIAL: suitable for stainless steel or any hard metal,significantly increases the ware-resistance and durability.
- STORAGE BOX:strong metal box.
- HOW TO USE:controlling the drilling speed by lowest RPM would make drill life much longer than 3 times.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Cobalt |
| Cutting Diameter | 0.25 Inches |
| Finish Type | Gold |
| Shank Type | Triangle |
| Cutting Angle String | 135 Degrees |
| Brand | INTOO |
| Tool Flute Type | Spiral |
| Minimum Bore Diameter | 0.06 Inches |
| Point Style | Split Point |
| Surface Recommendation | Metal |
| Number of Flutes | 2 |
| UPC | 791265838650 |
| Net Quantity | 1.0 Count |
| Manufacturer | LINRUI TOOLS |
| Number of Pieces | 21 |
| Country of Origin | USA |
| Model number | CO21 |
| Number of Memory Sticks | 300 |
| Item Weight | 454 g |
| Package Dimensions | 16.51 x 11.43 x 4.32 cm; 453.59 g |
| Item model number | CO21 |
| Power Source | ac |
| Are batteries included? | No |

## Product Details

- **Material:** Cobalt
- **Cutting Diameter:** 0.25 Inches
- **Finish Type:** Gold
- **Shank Type:** Triangle
- **Cutting Angle String:** 135 Degrees

## Images

![INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal - Image 1](https://m.media-amazon.com/images/I/71tgIXiD9zL.jpg)
![INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal - Image 2](https://m.media-amazon.com/images/I/616eJnP4ILL.jpg)
![INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal - Image 3](https://m.media-amazon.com/images/I/61C+GIrSKVL.jpg)
![INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal - Image 4](https://m.media-amazon.com/images/I/6118jHjFm0L.jpg)
![INTOO Hss Cobalt Drill Bits Set 21Pcs Triangle Shank,Industry Drill bits with Golden Ratio Tip,Patented Design for Stainless Steel and Hard Metal - Image 5](https://m.media-amazon.com/images/I/51zAxY4bFLL.jpg)

## Questions & Answers

**Q: Thank you for answering my first question. you said, "we takes the highest grade of the first one", do you mean highest grade of tin?**
A: Not only Tin, but also thickness of the Tin.

**Q: Where are they manufactured?**
A: Made in PRC

**Q: How do these do drilling through 1/4 steel?**
A: They do fine if you use cutting oil. If you try to drill it dry the bits will just spin and wear out.

**Q: What kind of titanium coating is on these? titanium nitride (tin), titanium carbonitride (ticn), titanium aluminum nitride (tiain)? thanks**
A: We use the first type（TIN）, but we takes the highest grade of the first one in terms of thickness, abrasion resistance and finish.

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-04*