TPI (20 pcs) M12x1.50 Premium Chrome Open End Bulge Acorn Wheel/Lug Nuts, B400045HT-20, .67" Tall, 3/4" / 19mm Hex Size Bulge open end acorn design, .67" Tall, 3/4" Hex, Cone Seat. 3 layers of brilliantly leveled Nickel undercoating followed by 1 reflective layer of chrome Greater seating surface to prevent damage during installation. Cold forged and heat-treated for Optimal Hardness. Precision Threads