The TUFLOC, from Esmet, Inc., was developed with utility, service and delivery vehicles in mind. Eliminating the shackle and hasp, this device does not have the weak points of conventional padlocks. Composed of two interlocking wings made from nickel-plated investment-cast 304 stainless steel, it is compatible with a variety of vehicle and building door types, including those which close inward, outward, are double-swinging, and sliding and roll-up. It can be mounted flush, at a 90-degree corner or even on an outside corner. It's bolt holes are recessed to resist tampering, and carriage bolts are positioned low within the wings reducing the possibility of forced entry.