This HTI attachment includes a full wrap 27mm hex wrench and a tire bead tool. Compatible with Beta rear axles and other bikes with a 27mm axle nut. Please verify your bike&';s fastener size before ordering and using, as some bikes vary. The bead tool is used to keep the tire bead in the drop center of the rim during tire installation. Weight = 35 grams The HTI (high torque interface) uses a spline interface called found on our Stache Moto Multi-tool. It allows for a compact and light wrench head that can hit high torque and/or large nut sizes. Best suited for axles, linkages, spark plugs, etc. The Stache Moto Multi-tool is required for proper use.