Tapered Spindles USA Buffing Wheel Set Of 2 R & L with 1/2&rdquo; Id Hole Polishing Motor TAPERED SPINDLES FOR 1/2" ARBOR SHAFT USE ON 1/2" SHAFT MOTOR - WITH 1/2" DIAMETER HOLE SET OF RIGHT & LEFT HAND THREADED - 4-5/16" LONG FEATURES:  Precision Quality  Machining is done by CNC Equipment  Made of Steel and Anodized Finish  Allen Set Screws do not protrude above the main shaft of the spindle. Tapered Threaded Spindles are made in the U.S.A. manufactured with close tolerances, runs true without any vibration with optimal performance of wheels and accessories being used. These Arbor - Spindles are used to hold Wheels with 1/8" or Pin Hole Centers: Polishing Buffs and Felt Wheels, Satin Finish wheels, Wood Hub Brushes... Spindles have 1/2" ID arbor holes to work on 1/2" shaft Motors or Polishers. The arbor is made with threading to be used on the RIGHT & LEFT Side of the motor (Marked R & L). Spindles have a pair of Allen Head Set Screws to attach to the motor shaft. Note: Always slightly tighten the front most set screw and then the one closest to the motor. Final tightness should be done after both are equally tight.