Lock and Hinge Lever Test
The effects of a jemmy attack against a security screen door or window grille are simulated by allowing a standardised narrow-bladed lever (representing a large screw driver) to be inserted against the locking, fastening and hinging points and a turning force (torque) is applied to those points via the lever.
The test panel fails if any of the hinges or locking points or their fixings fail, or if the edge of the security door has deflected to a gap wider than 15 cm.
Also all INVISI-GARD hinged security doors are manufactured with three point locks as a standard feature. Three point locks provide higher security as not only does the lock engage in the centre position but also has extra latches towards the top and bottom of the door that give even more strength.