*Premium Steel Structure: Chuck's body is made of quality cast iron. All guideways and bearing surfaces are precisely machined for better performance. Flimsy parts are specifically engineered by a quenching process to enhance durability. *Large Clamping Range: Each jaw can be adjusted separately to center with superior gripping force. Front Jaw Clamping Range: 1.8-2.5 in/45-63 mm. Back Jaw Clamping Range: 2.4-3.1 in/60-78 mm. *High-Performance Chuck: The wood lathe chuck jaws and three jaws are self-centering, the alignment accuracy is less than or equal to 0.002"" / 0.05 mm, and no adjustment is required after installation. The high precision design of the chuck bevel gear guarantees the accuracy of the chuck operation. *Effortless Operation: The lathe chuck has an automatic centering function, so it does not need to be repeatedly calibrated during installation. This complete lathe chuck set includes two jaws sets and a set of installation tools, which bring much convenience to your operation and save you more time. *Wide Application: Suitable for the general lathe, grinder, milling machine, drilling machine, machine accessories, woodworking machinery accessories, and other machine tools and accessories. *Specifications Material: Steel Chuck Diameter: 4 in / 100 mm Front Jaw Clamping Range: 1.8-2.5 in / 45-63 mm Back Jaw Clamping Range: 2.4-3.1 in / 60-78 mm Item Diameter: 4 x 4 in / 10 x 10 cm Item Weight: 15.6 lbs / 7 kg *Pakcage Content 1 x Lathe Chuck 1 x A Set of Accessories 1 x Tool Box