"Tough-Cut" octagonal boron-carbide shackle. Dual ball bearing locking for maximum pry resistance. "Dual-Armor" protection: laminated steel core for strength, stainless steel and zinc outer components for weather resistance. Chisel resistant recessed rivets. Reinforced body bumper for scratch resistance. 1-3/4 in wide case, 5/16 in shackle diameter, and 13/16 in horizontal shackle clearance.