"Tough-Cut" octagonal boron-carbide shackle. "Rust-Oleum" protection; no rust. Dual ball bearing locking for maximum pry resistance. "Dual-Armor" construction: laminated steel core with weather-resistant cover that protects against snow, rain, dirt, mud,grime, and salt. Covered keyway and shackle seal. 1-9/16 in wide case, 5/16 in diameter shackle, and 13/16 in horizontal shackle clearance.