Rigid Tap Collet, Tap Square Size 0.275 in, Compatible with Product Type BR Series Collet Pockets, DIN 6499 Series Collet Pockets, DR Series Collet Pockets, ER Series Collet Pockets, ESX Series Collet Pockets, RD Series Collet Pockets, Coolant Fed Coolant Through, Features Reduce Tapping Clearance Requirements, Special Design Locks Square in Slots