3 inch Super-Lock Precision C.N.C Machine Vise. Features a thrust bearing that increases clamping power by 80%. Jaw Width:3"; Jaw Opening: 2.953"; Jaw Depth: 0.945". L x W x H = 9.409" x 3.189" x 2.913". Body material: ductile cast iron. Wrench material: ductile iron. Workpiece Surface Flatness: 0.02/100mm Can be mounted upright or sideways. Excellent to use when you have multiple vise setups. Can not guarantee the exact location of the Keyway Slot. Need Machining the Keyway if they used in pairs.Internal refine grinding treatment, smooth use. No jamming, rust and corrosion resistance. The surface is quenched, turned, and ground, enabling strong toughness, high tensile strength, and wear resistance. Guide rail surface is a refined ground seamless contact surface. Can be used upright without affecting the accuracy of clamping capacity. For CNC milling machines, drilling machines, and precision parts. Accurately ground flat vise connects precisely with the machin 3 inch Super-Lock Precision C.N.C Machine Vise. Features a thrust bearing that increases clamping power by 80%. Jaw Width:3"; Jaw Opening: 2.953"; Jaw Depth: 0.945". L x W x H = 9.409" x 3.189" x 2.913"; Body material: ductile cast iron. Wrench material: ductile iron. Workpiece Surface Flatness: 0.02/100mm; Can be mounted upright or sideways. Excellent to use when you have multiple vise setups. Can not guarantee the exact location of the Keyway Slot. Need Machining the Keyway if they used in pairs.Internal refine grinding treatment, smooth use. No jamming, rust and corrosion resistance; The surface is quenched, turned, and ground, enabling strong toughness, high tensile strength, and wear resistance. Guide rail surface is a refined ground seamless contact surface. Can be used upright without affecting the accuracy of clamping capacity. For CNC milling machines, drilling machines, and precision parts; Accurately ground flat vise connects precisely with the machine tool, thus reaching an accuracy requirement of 0.0008" (0.02 mm)