BOTTOM BRACKET WHEELS MANUFACTURING SOCKET 16-NOTCH 48.5/44mmDouble sided socket tool for installing and removing both 48. 5mm and 44mm 16 notch bottom bracket cups 48. 5mm, 16 notch pattern matches up with Wheels Mfg bottom brackets, along with some FSA MegaEVO bottom brackets The 44mm, 16 notch side matches up with Wheels Mfg bottom brackets, along with many other outboard bearing bottom brackets including Shimano, FSA MegaEXO, Campagnolo Ultra Torque and SRAM Truvativ Socket is machined for 1 2` drive, but a