Screw Dustproof Crank Crankset Bicycle Accessories $ 3.87 Product Information: Color: Hexagonal type M818MM long anti-loosening screw/ 1 piece, ordinary type M815MM long anti-loosing screw/ 1 piece, normal type M818MM long rubber anti-loosing anti-loosing screw/ 1 piece, extended type M8 20MM long anti-drop glue anti-loosening screw / 1 Bottom axis screw (including anti-dropping glue) Specification M8X 15MM Applicable to the inner thread of the square hole Material 45# steel Weight about 13G Packing List: Stainless steel bicycle accessories x1