6 Piece Koken 3/8" Drive Wobble/Fix Extension Set (PK3763/6)

I purchased these after hearing many good things about Koken tools. I wanted a set of extensions to handle the variable space limitations which inevitably occur. The ability to have both a rigid and wobble extension in one unit is a big time saver. Push the socket all the way on and it's a rigid extension, slide it off slightly and it's a wobble extension. Pure genius. The knurling on the end helps when starting nuts and bolts in tight spaces with greasy fingers. I can't say enough good things about these extensions.

Can’t go wrong with Koken or retailer Harry J Epstein CO (the best tool store in Kansas City).

Engagement feature is positive and robust, socket and detent are well formed. Knurling for hand starting fasteners is excellent. Haven’t put them to an ultimate torque or abuse test, but I hope and expect that they will adhere to Koken’s high metallurgical standards. While certainly less expensive than tool truck brands, they are still pricey.