ONGUARD 5051 Boxer 5.5mm Disc Lock Pick, pull, and drill resistant Z-key cylinder featuring BumpBlok with flip dust cover Touch Lock system 5.5-10 millimeters [0.22-0.39 inch] ultra hardened steel pin 5 laser cut keys, 1 with a LED micro-light Three star plus level rating makes this a high theft resistant lock for high crime areas