The 227A two star brass handle pin vise has a 0 -.015 opening chuck. The overall length 3.5.Specs amp; FeaturesApplication: Provide a handle for various drill bits or probes., Quality: , Surface Resistivity : Conductive, Shape: Straight, Material: Brass, OAL: 3.5 (90mm), Tip Width: 0 - .015 (0 - .38mm)