Safety Chuck size 40-50 STW VT-1 by 2″..square, hardened to RC 56. Special drive shaft..2″ diameter by 6″ long. Keyway 1/2″ x 1/4″ x 6″..long. – Fabricated to 1.75″ diameter x 3.12″..long, keyway .50″ x .25″ x 3.125″