Description:1. Clamping Capacity: 1/32" -1/2" (1mm-13mm).2. MT4 Morse Taper Arbor.3. Drill Chuck Connection Type: JT334. Accuracy: 0.003"~0.005" (0.08~0.12mm).5. Maximum T.I.R. does not exceed 0.005".6. Self-tightening, key-less.7. Industrial design especially for milling machines and drilling machines.Specification:Product Name: Drill ChuckMaterial: S20Clamping Range: 1mm - 13mm / 1/32" -1/2"Model: MT4-APU13Arbor: MT4-JT33Accuracy: 0.003"~0.005" (0.08~0.12mm)Run Out: 0.005" (0.12mm)Dimension: 218 x 43mm / 8.58" x 1.69" (L*D)Package Content: 1 x Drill Chuck, 1 x Chuck Arbor.