Secure fasteners

A kit of secure fasteners for the Caelum wall system. Included is a special nut where the hexagon part of the Shear Nut shears off when the correct torque is achieved. This leaves a tamper resistant cone that is difficult to remove with conventional tools. The kits include shear nuts and load spreading washers for both 19x19mm and 20x30mm framework panels. Security can be improved further by combining with dome headed carriage bolts.