Trimax THEX50 The THEX50 is a "T-HEX" maximum security chain 5 ft in length with hardened 11 mm hexagon shaped links. Hexagon shaped case hardened trip heat treated super chain. The THEX33 is ideal for securing motorcycles, bicycles, ATVs, watercraft, ladders, construction equipment, trailers and much, much more. Best when used with a TRIMAX premium U-Lock or with a TRIMAX ultra strength padlock. TRIMAX makes the world's toughest locks. Through value added engineering design, TRIMAX is committed to product innovation that holds up to the highest quality standards. TRIMAX provides maximum security for marine, trailer and tow, RV, performance truck, power sports and bicycle applications. Tested. Tough. TRIMAX..