Made of steel material, light weight, rust-resistance and high strength. It's stable,wear resistance,hard and . Finely crafted, polishing grinding, great accessory for mountain bikes. Can be used for replacement of handle screws, aluminum alloy screws, bright color. Suitable for fixing the stem, front and derailleurs ring, seat post clamp, and front and derailleurs. Features - Color: Black. - Material: Steel. - Size: 2.00X2.00X2.00cm/0.79X0.79X0.79in - The surface is resistant to falling glue, than non-drop-resistant screws more easily locked. - This type of steel is able to withstand drastic weather and temperature changes including placement within extremely humid areas. - Suitable for square crankset, specification thread. - Suitable for square hole crankset and bottom bracket. - This product can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc. Package list: 10 x hexagon square hole screw