• High-strength zinc alloy cylinder and tongue, larger and thicker than normal ones. • Lock head coated in black with ABS protective cover to prevent rust and scratches. • 7 mm alloy steel chain bar, more resistant than the 6 mm one, difficult to cut. • Length of 90 cm, meets most usage scenarios, easy to transport and roll up. • 5-digit combination with up to 100,000 combinations, more secure than 4-digit ones. • No key required, lock with custom code, avoiding key loss issues. • Heat, corrosion, and wear-resistant nylon fabric cover, protects the chain and extends its lifespan. • Flexible use for locking vehicles, tree trunks, fences, pipes, and more.