ApplicationGeneral lathe, economical CNC lathes, grinding machines, milling machines, drilling and machine accessories etc..SpecificationsJaw: 4 Jaw Model: K12-125 High precision: ≤0.05mm Max RPM: 3800 r/min Color: Silver Material:Hardened Steel Application: for CNC Drilling Milling MachineLathe ChuckThickness: 58mm(2.283\") Center Hole: 30mm(1.181\") Bolt Circle Diameter: 108mm(4.252\") Runout: 0.003\" Internal Jaw Clamping Range (A-A1): 2.5- 40mm(0.098\"- 1.575\") Internal Jaw Jamming Range (B-B1):38- 125mm(1.496\"- 4.921\") External Jaw Clamping Range (C-C1):38- 110mm(1.496\"- 4.331\")Package Includes1 x Self-Centering Jaw 4 x Inside jaws 4 x outside jawslarge 1 x safety chuck key 3 x mounting boltsNoticePlease feel free to contact us for whatever we can help.