Ultra-Max 90 maximum-security lock features hardened chromoly construction with an oversize 16mm shackle; Max 80 is ideal for most motorcycle or bicycle applications and uses a 14mm shackle. Ultra-Max 90 is constructed from hardened chromoly steel and features an exclusive dual shear plate locking mechanism. Dual case bolt lock withstands more than 6.5 tons of pull force; shackle can withstand more than 8,000 lb. of expansion force. Shackle length and width specifically designed for motorcycles; hardened chromoly lock body Max 80 features a hardened lock body. Both feature locking mechanisms placed in the center of a ardened chromoly crossbar for maximum strength, seven-pin tubular pick- and drill-resistant lock cylinders and ballistic-grade polymer lock body housings to resist hammer strikes and scratching of painted surfaces. Shackles have protective PVC skins.