M12x1.5x12mm 60° Taper Seat. This listing is for a set of 4 x Locking Nuts. 60° Taper Seat for use with Aftermarket Alloys. 10.9 Grade Carbon Steel. Plated to ensure a quality finish which endures.Nut shaft Length 12mm, thread pitch M12x1.5. Security socket provided for application of locking nuts set (19 & 21mm 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.