Compatible with 1613 1617 1618 1619 Series Router 1/4 inch Compatible with Dewalt 326286-04, Bosch 2610906283, Hitachi 323-293 and Big Horn 19691 1/2 inch Compatible with Dewalt 326286-03, Bosch 2610906284, Hitachi 325-199 323-421 and Big Horn 19693 Collet features thickened design to minimize bit runout and enhance robustness Package include: 1PC 2610906283 1/4 " and 1PC 2610906284 1/2 router collet 2610906283 1/4” and 2610906284 1/2" Router Collet Kit Replacement For Bosch 1613 1617 1618 and 1619 Router