10.9 Grade Carbon steel. Plated to ensure a quality finish which endures. Nut diameter 12mm, thread pitch M12x1.5 with 60° Taper. Security socket provided with 17 & 19 mm dual hex head. Note- This product is designed to be used with Alloy Wheels Only, not steel wheels.
The key provided will only work with this set and not on existing locking bolts.