This HTI attachment includes a full wrap 13/16in spark plug wrench that is used on most full sized 2T bikes. Weight = 23 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.