*6061-T6 ALUMINUM- The belt grinder wheel is constructed with durable aluminum material, warp-proof, rust-proof, and corrosion-proof for long-term usage. It is durable and stable, ensuring smooth working. *4" DRIVE WHEEL- Drive wheel is CNC machined with a 0.75 inch/19 mm bore. Bore is equipped with a 0.24 inch/6 mm keyway. The wheel is 2.4 inch/61 mm wide. The surface is truly crowned to ensure the belt won't jump off the wheel. *3" TRACKING & 2" IDLER WHEEL- The 3" tracking wheel is 3" in diameter and 2.4" wide. The 2" idler wheels are 2" in diameter and 2.4" wide. 3 x heavy duty 1/2"/12 mm bearings fitted back to back in each wheel for max bearings life. There is a spacer between the bearings to relieve over-tightening. *EASY INSTALLATION- This belt grinder wheel set is easy to carry and use with small and lightweight features. The 1/2"/12 mm bearings can easily be replaced when worn. Stalling this wheel on machines is no fatigue. *FLEXIBLE USES- The knife grinder wheel set can satisfy your needs and work great in grinding metals, wood, acrylic, and other materials. It is widely used in parts factories, building materials factories, etc., perfect for tool polishing. ******************************************************************************************************* *Specifications Model: VV-BGW-41923 Drive Wheel Diameter: 4 inch/100 mm Drive Wheel Width: 2.4 inch/61 mm Bore: 0.75 inch/19 mm Keyway: 0.24 inch/6 mm Tracking Wheel Diameter: 3 inch/75 mm Idler Wheel Diameter: 2 inch/50 mm Tracking/Idler Wheel Width: 2.4 inch/61 mm Product Weight: 3.53 lbs/1.6 kg ******************************************************************************************************* *Pakcage Content 1 x Drive Wheel 1 x Tracking Wheel 2 x Idler Wheel 1 x Instruction