Lucas battery master switch that is designed to be panel mounted. The switch is rotary on-off type for battery isolation. Premium quality all metal switch with integral turn buckle style key.Suitable for either 12 or 24v applications it cuts the battery instantly and stops battery drain and is ideal for safety.12v 1500A intermittent load 500A continuous load24v 150A intermittent load 100A continuous loadfits hole size 20mm2 x stud terminalsHeight = 83mmDiameter = 42mm