Precisely machined from 7075 billet aluminum and then hard anodized, Abbey Bike Tools' Dual Sided Bottom Bracket Socket works with Shimano's DA 9000XTR BB93 as well 6800 Ultegra. The long lasting finish and exacting tolerances ensure cups aren't marred during installation or removal, preserving their quality aesthetics and the value of your investment. The Dual Sided Bottom Bracket Socket uses a 38 inch drive, so it's compatible with breaker bars to loosen stubborn cups, and it works with torque wrenches for proper installation. To assist with finding the proper torque, Abbey Bike Tools laser etches recommended specs in both newton meters and foot pounds. They also apply labels on the Dual Sided Bottom Bracket Socket for each side's application, and machine recesses along the outside to assist with grip helping to avoid crossing when initially threading the cups.