Mul-T-Lock TR 100 Hockey Puck High Security Round Padlock With Hasp .Keying Platform Classic Pro High security round padlock that is ideal for service vans, utility vans, delivery trucks, trailers and round hasp applications, the TR100 provides a strong, effective Security Solution to traditional padlock designs and applications. The unique shackle-less design enhances the High Security Protection against prying and cutting. The Hardened Steel one piece body design is reinforced with Anti-Drill pins to protect against drilling. Backed by MUL-T-LOCK's patented Interactive Key Control System, the TR100 not only offers maximum protection against physical attack, but virtually eliminates Unauthorized Key Duplication. Utilizing MUL-T-LOCK's proven telescopic pin tumbler mechanism, the TR100 provides the user with the flexibility of being able to operate the entire MUL-T-LOCK product range with a single key. Like all MUL-T-LOCK Products, this cylinder can be integrated into an expansive Master Key System, which will give the user complete control over every opening, and every key holder. MUL-T-LOCK's high security lock cylinders are designed to provide superior protection with uncompromised key control. The Key Card owner is the only person allowed to have the keys duplicated. Remove the worry about anyone making duplicates of your keys. Supplied standard with 1 owner key card per key combination and 2 keys per lock cylinder.