Use this double-sided socket tool for installing and removing both 48.5mm and 44mm 16-notch bottom bracket cups. Socket is machined for 1/2-inch drive, but a 3/8-inch to 1/2-inch adapter is included so you can use it with 3/8-inch drive torque wrenches. – Compatible with all Wheels Manufacturing bottom brackets that have 48.5mm or 44mm, 16-notch spline patterns – Also compatible with FSA MegaEVO BB cups, Shimano, SRAM/Truvativ, Campagnolo Ultra Torque, and FSA – Machined 6061 aluminum – Anodized red