Manufactured from Chrome Vanadium steel with a fully polished finish. Hardened, tempered and nickel chrome plated for corrosion resistance. Open-end and 12-point WallDrive® ring combination. Specification Manufactured from Chrome Vanadium steel with a fully polished finish. Hardened, tempered and nickel chrome plated for corrosion resistance. Open-end and 12-point WallDrive® ring combination. Lifetime guarantee*. Model No. S01010