Package Includes: as images show, 1/2" Router Collet 2 Pck.1/4" Router Collet 2 Pck. Size: 1/2-inch 12.7mm. 1/4-inch 6.35mm. Compatible With: Dewalt DW621 DW616 DW616M/D/PK DW616P/S/SK DW618 DW618D/M DW618P Router, For DW618B3 DW618B3E DW618PKB/K/PK DW621K, For Boschh 1617, 1617EVS, 1618, 1618EVS, 1613, 1613EVS, 1613AEVS, 1619EVS, MRC23EVSK, MRF23EVS, MRP23EV. Compatible With: Dewalt 326286-04; for Big Horn 19691; for Boschh 2610906283; for Hitachi 323-293 RC025DW For Dewalt DW621 DW616 DW616M/D/PK DW616P/S/SK DW618 DW618D/M DW618P Router;DW618B3 DW618B3E DW618PKB DW618K/PK DW621K. For Boschh 1617, 1617EVS, 1618, 1618EVS, 1613, 1613EVS, 1613AEVS, 1619EVS, MRC23EVSK, MRF23EVS, MRP23EV. For Dewalt DW616 Router Parts (Type 1), DW616D Router Parts (Type 1), DW618 Router Parts (Type 1), DW618D Router Parts (Type 1), DW621 Router Parts (Type 1), DW621 Router Parts (Type 2).