Brand New - Unused Parts Kit Includes: (1)1/4" Collet chuck Replaces Dewalt 326286-04, Bosch 2610906283 & Hitachi 323-293 - RC025DW (2)1/2" Collet chuck Replaces Dewalt 326286-03, Bosch 2610906284, Hitachi 323-421 - RC050DW (3)3/8" Collet chuck Replaces Bosch 2610906287 For Bosch 1613, 1617, 1618, and 1619 Series routers Compatible with the following: Bosch models: 1617EVS, 1604A, 1604A Shop, 1606A Shop, 1606A, 1613, 1613AEVS, 1613EVS, 1617 Shop, 1617, 1618 Shop, 1618EVS Shop, 1619EVS, B1350, B1450, 16171 2HP, 16176 2.25HP, 16181 2HP, 16186 2.25HP, 13020, 1604A, 1604A, 1604A, 1604A, 1604A, 1606A, 1613AEVS, 1649, MRF23EVS 2. Fixed-Based