- Holds socket tool to BB axle to eliminate slippage during removal and installation. New spring preload allows increased flexibility and rotation during use. - New design works with square taper and splined axles with M8, M12, or M15 internal spindle thread. - Made from heat-treated tool steel for the ultimate in strength and lasting performance. - Use with Pedro's Splined Bottom Bracket Socket. Compatible with Pedro's Pro Socket Handle. If you have ever battled with an over-tightened Shimano and ISIS Drive splined bottom bracket cup, you know why Pedro's created the BB Socket Holder. Though these types of bottom brackets proved themselves as the standard for many years and continue to be found on many bikes, the tendency for their shallow splines to slip during removal or installation has resulted in more than a few expletives, high frustration levels, and worst of all, injuries. The Pedro's BB Socket Holder II provides a simple, shop-quality tool that solves this problem. The new design works on bottom brackets spindles with M8, M12, or M15 threads and adds spring preload for increased flexibility and rotation during use. Backed by Pedro's lifetime warranty.