Inner hole design: The focus point is shifted to the nut plane to prevent slippage, protect the nut, increase torque, and save effort The forging component of chromium vanadium steel far exceeds that of peers, and the materials are solid The size is accurate, and the hexagonal stop gauge is highly consistent Laser specifications: knurling, anti-shedding groove, hexagonal head chamfer, square head chamfer, hexagonal head r angle, square head r angle Double-layer chrome plating process, thicker coating, wear-resistant and rust-resistant