Makes of 316 Antirust steels, it have excellent strength, durability, and excellent antirust and resistance. Will not deforms and break. Small in size, and easy to carry outdoor for easy replacement, it is a very convenience surfings part. Easy to installation, these surfboard screws can freely installed and disassemble without the need for any . There is a black silicones hoop that fit tightly, makings the surfboard screws more stable and increasing their service life. Widely used, this surfboard screw is suitable for longboards and paddleboards.