MuscleChuck Camless Quick Change 1/2-Inch Chuck Fits Selected Triton and Rigid Type 11:Fits Triton TRA001, MOF001 with internal threads 1/2-inch shank can use bushings for 1/4-inch, 8mm and 3/8-inch shanks. Length: 1.3 in (Approx) Run Out: &lt;.002 in High Quality Alloy Steel. All materials and processes certified to aircraft standards.