Models View all GBB Metal-Polymer Bearings DU series metric 1 8 0 T-slot plate ISEL PT25, PT50 2 39 0 Collet nut 8 281 2 Collet ISO15488 8 239 0 Retention knob 3 133 1 SK 40/MAS BT 40 Tool shanks with 7/24 taper 30 1268 1