This is the original design DPDT (Double Pole Double Throw) knife switch with brass contacts and steel screws. Traditionally it has been used in many vintage equipment but now is mainly used for education purpose. Not for high voltage applications. Recomended voltage range is 1 Volt up to 24 Volts. Max 10 Ampers. Orders of 10 and more receive bulk pricing discounts. Base size: L x W x H = 59 x 38 x 8 millimeters. Overall size L x W x H = 76 x 38 x 30 millimeters. Each switch has six connection screws. To connect wires start by loosening the screw. Then form a loop of wire under the screw head and finally tighten the screw to hold the wire in place.