1.Quality Material: The lathe chuck body is made of high-quality hardened steel, and the hardness test of the jaws and guides is HRC 58-62. It has high strength and toughness, compression resistance and durability, and long service life. 2.High Precision: 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. 3.2 Sets of Jaws: This chuck includes two sets of internal and external jaws. The clamping range of this chuck is between 0.12"" / 3 mm - 6.3"" / 160 mm, which is suitable for clamping a variety of industrial parts. 4.Fast Clamping Speed: The lathe chuck has an automatic centering function, so it does not need to be repeatedly calibrated during installation. It only needs to be installed in the correct order, which is simple, fast, and convenient. 5.High Adaptability: This scroll chuck is highly adaptable and can be used with the same series of jaws, which is suitable for a variety of parts such as hanging shafts, disks, equilateral triangles, etc. ******************************************************************************************************* *Specifications Material: Hardened Steel Model: K11-160 Jaw: 3 Jaw High Precision: 0.002"" / 0.05 mm Color: Silver Mounting Thread: 3-M8 Lathe Chuck Size: 6.3"" / 160 mm Outside Diameter: 6.3"" / 160 mm Bolt Circle Diameter: 5.59"" / 142 mm Center Thru Hole Diameter: 1.77"" / 45 mm Chuck Body Thickness: 2.56"" / 65 mm Internal Jaw Clamping Range (A-A1): 0.12""-2.17"" / 3-55 mm Internal Jaw Jamming Range (B-B1): 1.97""-6.3"" / 50-160 mm External Jaw Clamping Range (C-C1): 2.17""-5.7"" / 55-145 mm Accuracy: 0.002"" / 0.051 mm Item Weight: 18.4 lbs / 8.35 kg Package Dimensions (L x W x H): 8.3"" x 8.3"" x 6.7"" / 21 x 21 x 17 cm ******************************************************************************************************* *Pakcage Content 1 x 6.3"" / 160 mm Lathe Chuck Body 3 x Internal Jaws 3 x External Jaws 3 x Mounting Bolts 1 x Chuck Key