* These replacement backs fit both the original ATTs and the ATTsiw alarm heads and they negate the need for separate snag ears, offering greater security from the rod being dragged out of the buzzer. * Feature higher parallel ears – the height of the ears has been increased from 18mm to 28mm. * Also feature two recesses for the glue fit of a pair of 6 x 2mm Gardner Tritium Max betalights. * Simply unscrew the original back plate from your ATT alarm and replace it with a Snag Back (replacing the gasket for a perfect seal). * Snag Backs are supplied with 4 x screws and 1 x replacement gasket seal.