WK1 – basic safety measures to resist attempts at theft, but not the tools
WK2 – intrusion is made with the aid of a screwdriver, pliers, etc., to force the opening of a door or window
WK3 – using a second screwdriver or crowbar to force the opening of locked doors or Windows
WK4 – use of saws, hammers, axes and levers, as well as battery-powered machines