Set your own secret number from 10,000 choices. Exclusive positive action change key permits quick, easy resetting. Once shackle is closed, automatic tamper guard of hardened steel blocks keyway, protects against tampering. Corrosion-resistant solid brasscase. Nickel-plated case hardened steel shackle. Independently double locking shackle legs. 2 in wide case, 5/16 in diameter shackle, and 1 in horizontal shackle clearance.