The Shackless Lock is commonly referred to as a Hockey Puck or Puck Lock due to the perfectly round shape. This is an excellent for superior security. The shackleless design provides protection against sawing, cutting and prying.
This is a Professional Grade solid steel lock, not a cast steel product that can be compromised with a screwdriver and hammer.
Each lock weights about one pound. The solid brass cylinders are available in 5 or 6 pin.