Material:Made of plastic, No rust, better protection for the aluminum bar end. Size: 40*40mm( L*W),Mounting Hold Diameter: 7mm.Package Includes:60 x Aluminum Profile End Cap 40x40mm. The Aluminum Profile End Cap Widely used for 3D printers and industrial aluminum frame. Easy to install：Installation is very simple,Just push in.Cover the end of the aluminum profile and avoid scratch to people. Widely used in the climbing platform, fish tank rack, storage rack, shade house, trolley, and so on., Weight: 0.6172943341176573 Pounds, Manufacturer: BuxiuGK