Frame mounting brackets for Trelock lock range. ZB401 Universal U Lock bracket for 15-55mm Diameter frame tubes ZB402 Universal side mount U Lock bracket for 15-55mm Diameter frame tubes ZB403 3 point bracket for U Lock, armoured cable and cable locks. 5-17mm tube diameter ZB501 Variotex frame bracket for U Lock for 17-60mm Diameter frame tubes. ZB502 Variotex side mount frame bracket for U Lock for 17-60mm Diameter frame tubes.