The Master Lock No. 9130EURT heavy-duty aluminum padlock features a 30 mm wide solid aluminum 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 much 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 helps prevent theft, and the double locking levers offer resistance against prying and hammering. The limited lifetime warranty gives you the assurance of a brand you can trust.