FIRSTINFO F3220DD 3.4:1 Compact Torque Multiplier 600 Nm - 1/2 inch Drive (Male) to 1/2 inch Drive (Female) Adaptor Max. 600 Nm/Labor Saving Tool for Lug Nut

The media could not be loaded. I bought this to remedy having using a super long cheater pipe's on socket wrenches to get extra torque for breaking loose or tightening big nuts/bolts over 300 ft/lbs. I fabricated a handle extension from steel tubing to use it for that application. Caution in drilling the handle as it is hardened steel. I put three stainless bolts thru and attached a 40+inch handle. This works similar to the much more expensive Torque multiplication wrenches costing $300.00 bucks and beyond. I can still use it as normal to break loose tire lug nuts since the handle is mounted on the outside of the arm, just reverse insert the multiplier thru the wrench opening (*its backwards displayed in my picture if you were loosening lug nuts on Tire).Price and quality are goodSatisfied customer

Important first note, I only used this to torque a nut to 500 ft/lbs so I didn't push it to its claimed limit. This worked perfectly for me and was incredibly less expensive than a torque wrench with the same capability would have been. The multiplier has a range of accuracy of something like 4% which has to be figured along with the accuracy of the torque wrench you're using as well. This could result in a relatively large variance in actual torque applied but that's the payoff for saving a couple hundred dollars (minimum) on a higher capacity torque wrench.

I was very happy to find a torque multiplier this small so that it could be used to turn engines for the purpose of adjusting valve clearance.

Will not work on RV trailers with center hub caps , you need a deep socket and then the support ancor is not long enough to reach into wheel web to incorporate multiplier . Center cap will not come out until wheel is off comes out the back of wheel

Based on some of the other reviews about sticking & early deaths due to binding, I decided to take apart and check construction quality before first use. Unit comes apart easily, two circlips. Gears all looked well made all things considered. The factory grease looks like standard, clear, non- extreme pressure grease. I cleaned out the factory grease, and two small metal chips, and degreased with brake cleaner. Applied a thin coat of Liqui Moly LM47 assembly paste to *all* internal surfaces & gear teeth with a brush. Temporary reassembled & burnished that in a bit (rotated by hand quickly, both directions). Added ~20 grams MoS2 grease (LM 48) to the gear pack & reassembled & operated by hand to distribute. Operated a lot more smoothly than right out of the box (a bit more resistance due to the more substantial grease, but smooth). Only used it on a few bolts so far, that are in the 250-350 ft-lb. torque range. Works well. Used a large adjustable wrench as a reaction bar in some situations. I try to keep the reaction wrench located where the internal ring gear is located (over the laser marked text "...1/2 Ratio" on my tool).

The converter allowed me to use a smaller torque wrench to get the job done

Decent little unit for a cheap price. Worked well until it broke for about 10 out of 48 1” bolts

My 18 inch ratchet was unable to move the lug nut which I had tightened last week with an 18 inch breaker bar. I had to use the breaker bar attached to this tool to loosen the lug nut. When one turn the device without any load one can feel it tighten up at the same point on each revolution. With extra effort it then goes into a period of smooth turning and then it tighten up again. Seems to me that some of the gears are messed up. Either this one is defective or the youtube videos are fake. Either case this one will go back next week. Now to find a functioning replacement.