This is the original design SPDT (Single Pole Double Throw) knife switch with brass screws. Traditionally it has been used in many vintage equipment but now is mainly used for education purpose.
This switch is also known as a three-way switch. It is used when you need to control one light bulb with two switches.
Orders of 10 and more receive bulk pricing discounts.
Base size: L x W x H = 59 x 22 x 8 millimeters.
See bulk pricing discounts bellow: