Customers often ask about the difference between available Puck (shackle-less) padlocks.

• Masterlock 6271 is the economy version. A die-cast steel lock body with the cylinder integrated in the locking pin mechanism. A simple and effective design.
• American 2500 has a much more complicated construction with a machined steel lock body, front located cylinder for easy access and spring-loaded locking pin . The back plate covering the locking mechanism is chromed and held in place with stainless screws. The front cylinder also has a spinning anti-drill plate. The 2500 can be permanently mounted on the right side of the #801 or #802 hasps.
• TR100 by Mul-T-Lock, a Abloy company,  is made in Israel. Machined from a solid block of steel and fitted with probably the most secure cylinder / key system in the industry. Mul-T-Lock's patented Interactive key system offers the highest protection against picking and is compatible with any other Mul-T-lock padlock.

Shackle-less padlocks are primarily used on trailer and van doors. A very secure solution when combined with a puck-lock hasp.