Arbor - Spindle is made in the U.S.A. manufactured with close tolerances, runs true without any vibration with optimal performance of wheels and accessories being used. This Arbor - Spindle is used to hold Wheels with 1/2" arbor holes: Abrasives, Drum Sanders, De-Burring, Buffs and Felt Wheels and more. Arbor hole on this Spindle is a 5/8" to work on 5/8" diameter shaft Grinders, Motors or Polishers. The arbor is made with threading to be used on the LEFT Side of the motor, fastened and held on the motor shaft with 2 Allen Head Set Screws. 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. JETS Product # 1603-853475 FEATURES: · Precision Quality · Machining is done by CNC Equipment · Made of Steel and Anodized Black Finish · Set of Allen Screw do not protrude above the main shaft of the spindle. · Spindle comes with 2 Steel Machined Washers · Left Hand 1/2" x 20 Nut · Quality Hardware (Washers and Screws) Specifications: - Material: Cold Rolled Steel - Overall Length: 3-7/16" - 87.3mm - Arbor Body Diameter: 1" - 25.3mm - Spindle Body Length: 1-9/16" - 39.7mm - Spindle Shaft Length: 1-7/8" - 47.65mm - Arbor Hole: 5/8" - 15.87mm for Shaft Connection - Spindle Shaft Diameter: 1/2" - 12.7mm - Weight: 7.3oz. - 207gr >>> Spindle is made to be used on a 5/8" shaft diameter and on the LEFT Hand Side of Motor with forward direction. Item is New Never Used.