A-B1056534MA-AI KEY SQUAREOne New Aftermarket Replacement Square Key for Murray, Fits Craftsman, Snapper, and Simplicity Lawn Tractors and Snowblowers This square key (also called a machine key or parallel key) seats into the keyway on the auger shaft or drive shaft pulley to transmit torque and lock the pulley in position. It is a common wear and replacement item used with a number of different auger and drive pulleys, including pulley 1501211MA, on Murray, Fits Craftsman,