Compare DART Step Drill Set Two Flute 3 piece Dart Log in for pricing DART Step Drill Set Straight Flute 4-12, 4-20, & 4-30mm Precision engineered steel bits with straight flute tapered cutting edges allowing for deburring or chamfering of the hole drilled. HSS ground. Split point for spot drilling... SSTFSET3 Log in for pricing Compare Stock: Qty in Cart: 0 Price: Log in for pricing Subtotal: