Safety Chuck size 30-40 FLW by 1.25″ square…Special drive shaft 1.375″ diameter by 6″ long…Keyway 0.313″ x 0.156″ x 6″ long. Shaft..fabricated to 1.25″ diameter x 6″ long, keyway..180 degrees from existing kewyay – .25″ x .125″..x 6″