The Talon scroll chucks have a nickel-plated body, case-hardened base jaws and a scroll coated with a dry, long-lasting lubricant. Precisely made, the chuck body typically has less than 0.001" of runout; with the jaws mounted, runout can be expected to be less than 0.005". Due to their special construction, the jaws can be easily tightened on round or square stock. A stop pin prevents overextension of the jaws. The chucks use a 5:1 ratio chuck key for tightening, ensuring greater holding power on large pieces, and weigh about 3 1/2 lb.