The Wolf Tooth Pack Ultralight 1in Hex and Bottom Bracket Wrench is high quality but weight conscious for those who perform mobile maintenance or travel with their bike. This ultralight hex and bottom bracket wrench has a 1-inch hex at one end and an external BB cup spline at the other end (also often used for centerlock rotors). The 1-inch hex end features magnets that quickly couple with our steel hex insert tools. The side of the tool has a chainline measurement ruler. Wolf Tooth developed some very specific Pack Tools that are high quality but weight conscious for those who perform mobile wrenching, travel with their bike, or just want one set of tools that can be thrown in when heading to the trail. Wolf Tooth Pack Ultralight 1in Hex and Bottom Bracket Wrench Features Includes the wrench only. Steel inserts are not included but can be purchased separately or as a set. 1-inch hex drive interface compatible. Magnets inset allow quick coupling and decoupling of steel inserts. 16 notch 44 mm bottom bracket tool (or center lock rotor tool) compatible Compatibility: 1-inch hex drive at one end and 16-notch 44mm bottom bracket tool (or centerlock rotor tool) at the other end Wolf Tooth Pack Ultralight 1in Hex and Bottom Bracket Wrench Specifications Weight:  88g Material: 7075-T6 aluminum Made in the USA