American Lock's solid steel round, heavy-duty, hidden shackle padlocks are the toughest padlocks of their type ever offered to those who are serious about security.

Master Lock 510D 1-3/4-inch wide lock with adjustable shackle. Removable adjustable-length shackle from 5/8-inch to 2-inch provides maximum application flexibility.

Generous Range Of Key Variations. Use To Secure Storage Tank Caps, Well Covers, Outdoor Lockers, Sheds, And Other Medium Security Places.