All Moto-Stop wrenches are made of steel with a black oxide finish. The pin assembly is made up of an Allen cap screw with a replaceable treated dowel pin pressed into the body. This assembly design allows you to replace a pin if damaged by unscrewing the cap-screw and replacing it with a new one. Moto-Stop tilt cylinder wrenches have been specifically designed to solve the problem of removing the aluminum cap from the Yamaha OR Mercury tilt cylinder assembly without destroying it. We also sell replacement pins.