BOSCH uses micro grain carbide and a special heat-treating process to provide precision and durability with router bits. This accuracy is achieved across hundreds of profiles for mortising, spiral cuts and eding in wood, plus specialty cuts in plastic and laminate. Industrial router bits and components are the professional's choice. The BOSCH 3607000645 8mm Collet Chuck is designed for use with BOSCH 1617, 1617EVS, 1617EVSPK, 1618, 1618EVS, 1613, 1613EVS, 1613AEVS, 1619EVS, MRF23EVS, MRP23EVS, and MRC23EVSK Routers.