Our G8748 Hand Tapping Machine provides stability precision and sensitivity to the hand tapping process. The cast iron construction of the base and over-arm gives a rigid setup that resists tool breakage. Precision ground surface on the base and hardened spindle means perpendicular perfection; no more off-axis tapped holes. The counter-balanced spindle allows far more sensitivity than an ordinary tap handle. Other features include: quick setting work holder 9 tap holders that snap-lock into spindle rack for tap holders adjustable height collar and off-set handles for quick return. Can be bolted down to use as a tapping station. Collet sizes include: -6 -8 -10 1/4" 5/16" 7/16" 3/8" 1/2" and 5/8".