Security for basic applications. Laminated steel case with 4-pin tumbler mechanism. Dual-locking system independently locks each shackle leg for added strength. Plastic bumper protects against marring and scratching. Hardened steel shackle. Two keys included. 1803 has 1-1/2 in wide case, 1/4 in diameter shackle, and 3/4 in horizontal shackle clearance. 1805 has 2 in wide case, 5/16 in diameter shackle, and 1 in horizontal shackle clearance. 1807 has 1-1/8 in wide case, 3/16 in diameter shackle, and 9/16 in horizontal shackle clearance.