FEATURES:Stepped drill bit, stop collar, and thickness gauge/wrench for Kreg??Pocket-Hole JigsWorks with materials from ?? to 1?? thickDrill bit features easy-set etched markings for ??, ??, 1?? materialsStop collar window aligns with etched markings on drill bit for easy setupThickness Gauge measures material thickness, has built-in hex wrenchDirect replacement for items included with Kreg??Pocket-Hole Jig 320, 310Also works with K5, K4, K3, R3, Mini, and Foreman