This pocket size kit is a complete disassembly tool. It includes a built in spanner wrench, which makes it very easy to hold both the wrench and the knife at the same time while making pivot adjustments. The head unscrews from the main body, which contains a precisely machined screw driver blade that matches the slot on the pivot screw of the XM-18. The head will also hold any standard 1/4" bit. We include a 5/64" hex that works on the XM-18 3.5" & XM-24 handle screws. The crossed drilled hole in the male end is there so you can use it as a T handle for extra torque. These are made from 17-4 PH hardened stainless steel, with a bead blast finish.