Chuang Qian Belt Grinder 2x72 Wheel Set Perfect for Knife Grinder Complete Belt Knife Grinder Wheel Set (45/8-3-2) Feature 4" Drive Wheel 4" drive wheel is CNC machined with a 5/8 inch bore. The bore is equipped with a 3/16 inch keyway. The surface of the wheel is crowned to ensure the belt don't jump off the wheel. 3" Tracking & 2" Idler Wheel The heavy duty bearings fitted back to back in each wheel for max bearings life. And there is a spacer between the bearings to prevent over-tightening. Simple Installation Easy and reliable mounting method. This belt grinder wheel set is easy to carry and use with small and lightweight. The bearings can be easily replaced when worn. The knife grinder wheel set can meet 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. Superior Material The belt grinder wheel is made from top quality Aluminum, warp-proof, impact resistance, sturdy and durable. High precision and hardness ensure long-term reliable service. 100% Satisfaction Guarantee If you're not satisfied with this Belt Grinder 2x72 Wheel Set, simply return it for a full refund in 30 days. While you have any questions about our products, please feel free to contact us and we will provide the best service. Profuct Description