Sierra MP41040 Ignition Switch - Acc-Off-Run-Start Sierra products are engineered to meet todays high horsepower engine demands and stand up in the harsh marine environment. All Sierra products meet or exceed the original equipment part it replaces. Sierra supplies many OEM engine manufacturers and boat builders hundreds of quality parts every day. Backup Nut: brass; Face Nut: knurled black plastic Hole Size: 7/8"; Length: short 1-1/8" maximum panel thickness Rated: 15 Amp @ 12 VDC Terminal Type: 4 Screw Tab