1. Standard Length Specification Roller 38mm/1.5''Shaft 12mm(1/2''); Roller 50mm/1.5''Shaft 12mm(1/2'') 2. Stainless Steel Unpowered Rollers: Replacement Conveyor Belt Rollers are made of durable stainless steel material that is waterproof, rustproof, and will not warp. They can be used to handle and transport goods of varying weights up to 41kg/90 lbs. Powerless rollers rely only on the object's own gravity to propel the movement, reducing mechanical failures and maintenance costs. 3. Spring pressin Mounting: One of the standout features of the HeavyDuty Conveyor Roller is its spring installation mechanism, which makes assembly easy. The innovative design allows for effortless installation simply push the spring in or pull it out from the other side to securely install the roller into the conveyor frame. 4. s: The steel rollers are versatile as rollers or conveyor replacement rollers for roller stands in woodworking, saw stands, material stand rollers, boat rollers, dock rollers. They are perfect for DIY woodworking projects, metalworking, or any other heavyduty application! These durable long rollers, when used with suitable brackets, may also be part of a cat dog jumping fence solution.