★ All nuts are hexagon (heptagon) lock nuts. Since it has a 7-sided shape, it cannot be tightened or removed without the use of a dedicated adapter. Helps prevent wheel theft of your vehicle. ★ Nuts are forged from high strength steel material. Made from raw materials that add carbon to iron and became the so-called steel (peel-off), so it is just hard! ★Stronger than aluminum. ■Steel Heptagon nut ■Set Contents: 20 pieces / 24 pieces socket included ■Diameter: 20 mm ■Total length: 32 mm ■Screw size: 12 mm ■Pitch size: 1.5 mm ■Seat taper angle: 60 degree ※This product is a wheel nut with a 60 degree taper. Do not use on wheels that support spherical or planes. ★As this is an overseas product, instruction manual is not included. ★This product is a brand new and unused product, but please understand that there may be some scratches or stains due to shipping or storage. ★There may be slight differences in color between the photo and the finish depending on the loPlease be aware of