This switch makes a great alternative to the Carling 110-63 SPST especially if you are on a budget. The quality is superb. One difference to note is the position of the key-way on the bushing which is flipped 180 degrees from that found on the Carling switch. In other words, the key-way is on the opposite side of the bushing with respect to the Carling part. The ON/OFF actuator positions are identical to the Carling. The actuator length is somewhat longer than the one found on the Carling switch.