ess GrindingAny straight or multiple diameter part where the straight diameter is the largest.Headed Parts / Bolts / Studs Rivets / PinsDowel Pins / PinsCall (800) 840-9562 for Complete Centerless Grinding Assistance Quality Centerless Grinding is equipped to grind a wide variety of studs, pins, bolts, screws, bushings, and other parts from a full range of materials.