Zak Tool ZT15-SW Black Swivel Extension Tool - Universal Socket Wrench for Automotive Repair & DIY Projects

I've purchased and owned two of these over seven years. This Smith and Wesson-key compatible one includes a retention pin not found on an earlier model. It works with all standard key locks.The only downside is the cap can come loose and is easily lost. When you first get it, I'd recommend placing some non-permanent threadlocker (Loctite) on it.These are hands down the best handcuff key extension tools. I've seen some guys get other similar ones from no-name companies.. They are basically poorly-made knockoffs.