Two locking screws, not just one, hold this quick positioning featherboard securely in a standard 3/8" x 3/4" miter slot. The featherboard keeps stock tight against the fence with flexible "feathers", helps prevent chatter while cutting and greatly reduces dangerous kickback. This unit is made of sturdy plastic, is 3/4" T x 4-3/4" W x 6-1/4" L and has 4-1/2" of travel. Adjustable depth 80mm. Feather area is 115mm long.