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. The 1-inch hex end features magnets that quickly couple with Wolf Tooth's steel hex insert tools.1-inch hex drive at one end and 16-notch 44mm bottom bracket tool (or centerlock rotor tool) at the other endIncludes the wrench only. Steel inserts are not included but can be purchased separately1-inch hex drive interface compatible. Magnets inset allow quick coupling and decoupling of steel inserts