Climax Metal, AS-4FS-L, 1/2" Motor Shaft Arbor Heavy Duty Type D - Stamped Washer Nut Lock Type Arbors for smooth shafts. Ideal for mounting various abrasive wheels. Socket set screws secure the arbor to the shaft. Arbors designed especially for larger buffing and polishing units. The wider shoulder provides ample clearance plus additional space for easy movement and positioning of work pieces.