1.Specification: Package includes: 4 Pack Rollers. Roller Diameter 50mm(2 Inch)Shaft Diameter: 12mm(1/2 inch). It is ideal for all your cargo transportation needs 2.Stainless Steel Rollers: Constructed of a stainless steel, rustresistant, waterproof, smooth and durable. These rollers operate quietly and produce minimal vibrations ensuring smooth and efficient operation 3.Easy to Install: Springretained for easy assembly. It is effortless to fit the roller into the conveyor frame by simply pushing the spring in or pulling from the other side. Quick installation and disassembly for your roller conveyor system 4.s: The steel rollers can be used as rollers or conveyor replacement roller for roller stand for woodworking, saw stand, material stand roller, boat roller, dock rollers. They are perfect for DIY woodworking projects, metalworking, or any other heavyduty application! These durable long rollers can also be part of a cat dog jumping fence solution when used with suitable brackets