The Master Lock No. 9131EURTCOL covered solid aluminum padlock features a 30 mm wide covered solid aluminum lock body that is durable and corrosion-resistant. Ideal for indoor use, this combination lock is best suited for school lockers, gyms, travel luggage, suitcases, briefcases, backpacks, and more. The shackle, with a diameter of 5 mm and a length of 18 mm, is made of hardened steel, providing extra resistance against cutting and sawing. The 4-pin cylinder prevents theft, and the double locking levers offer resistance against prying and hammering. The assorted colors simplify locker identification. The lifetime limited warranty gives you the assurance of a brand you can trust.