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. A 3/4" Arbor Hole 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 3/4" to work on 3/4" diameter shaft Grinders - Motors. The arbor is made to be used on the RIGHT Side of the motor, with right hand threading, 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 # 1603-963475 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 · Right Hand 1/2" x 20 Nickel Plated Nut · Quality Hardware (Washers and Screws) Specifications: - Material: Cold Rolled Steel - Overall Length: 4-5/64" - 103.65mm - Arbor Body Diameter: 1-1/8" - 28.57mm - Spindle Body Length: 1-35/64" - 39.24mm - Spindle 1/2" Shaft Length: 2-17/32" - 64.2mm - Arbor Hole: 3/4" - 19.0mm for Shaft Connection - Arbor Shaft Depth: 1-1/4" - 32.0mm - Weight: 8.25z. - 234gr Spindle is made to be used on a 3/4" shaft diameter and on the RIGHT Hand Side of Motor with forward direction. Item is New Never Used.