Do these have the notch to lock onto quick release ratchets?

Yes they do, they work good on the couple quick release ratchets I own.

What is the difference between 81200D and 81200?

the set 81200D is the standard 3/8 drive extension bars there is a set 81201 which is the 3/8 wobble extension bars. there is no set 81200 on the gearwrench website

what are the lengths? thanks!

If you scroll don the page on Amazon, you will see the sizes listed: "The KD Tools 4-Piece 3/8-Inch Drive Extension Set includes 1-1/2-inch, 3-inch, 6-inch, and 12-inch extensions."

ASIN	B000NI93A2
Best Sellers Rank	#124,078 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #614 in Socket Wrenches
Bit Compatibilities	3/8 inch drive bits
Brand	GEARWRENCH
Brand Name	GEARWRENCH
Country of Publication	China
Customer Reviews	4.8 out of 5 stars 1,543 Reviews
Drive Bit Shank Style	Tang
Drive System	External Hex
Drive system	External Hex
Finish Types	Polished
Finish type	Polished
Global Trade Identification Number	00099575812002
Included Components	1-1/2", 3", 6" & 12" Extensions
Item Length	12 Inches
Item Type Name	Gearwrench 81200D 4 Piece 3/8-Inch Drive Extension Set
Item Weight	1.3 Pounds
Item length	12 Inches
Manufacturer	GearWrench
Material	Alloy Steel
Material Type	Alloy Steel
Model Number	81200D
Number of Pieces	4
Number of pieces	4
UPC	787721773214 077349429113 971477621664 100069440028 785533915563 995758120028 021112613698 099575812002
Unit Count	1 Count

GEARWRENCH 4 Pc. 3/8" Drive Extension Set, 1-1/2", 3", 6" & 12" - 81200D

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