The Wolf Tooth Components Pack Wrench is an ultralight tool designed to be taken with you on long rides or trips that require maintenance and assembly of your bike. The wrench acts as a stand alone 16 notch 44mm bottom bracket tool but is also compatible with Wolf Tooth's Pack Tool Inserts, meaning you won't have to carry 50lbs worth of tools to do a wide array of mobile mechanics, unless, of course, you want to. 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 Centerlock Rotor Lockring tool) compatible Made in the USA Specifications: Weight:105g Material: 7075-T6 Aluminum Color: Red