Solid brass lock body. Three-dial resettable combination. Bronze plated steel shackle. 1,000 possible combinations. 620 has 13/16 in wide case, 1/8 in diameter shackle, and 3/8 in horizontal shackle clearance. 630 has 1-3/16 in wide case, 3/16 in diameter shackle,and 9/16 in horizontal shackle clearance.