Ignition Switch Caterpillar Aftermarket 7N0718 , 7H7290 Master Removable key is ideal for construction and tractor equipment as an absolutely essential theft deterrent for equipment in the field Strictly Quality Control,Fully Test Before Shippment Features: Measures 2 43/64" at Widest Point Measures 3 9/16" Long from Post to top of key hole. Comes with 15/16" Mounting nut over keyhole. Posts on the back comes with 9/16" Nut. Specifications: This Switch has two 3/8" Rear Mount studs for cable ends. It is designed as a replacement for the Cat 7N0718. But, it can also be used anywhere you can drill a 3/4" Main hole and a 1/4" hole for a position hing post (on the Front Left as pictured). For Heavy Duty 12-24 Volt applications. This is made for Negative or return power Disconnection of the primary power source. It could be used to change over or modify some or All of a fleet with keys