Specifications: EVA high shock absorption material is used to protect the product in all directions. Brand: DSPIAE Name: Universal Clamping Hand Drill Model: AT-VHD Size: 22*9cm Material: aluminum alloy Installation process: 1. Turn the black knob counterclockwise, 2. Insert the required drill bit into the fixture, 3.Tighten the knob counterclockwise. Precautions: Avoid rubbing this item with hard objects Do not throw or drop this item Avoid letting children under 10 years old come into contact with this item Notes: please allow 1-3cm error of measurement. Photo color might be a little different from the actual product due to color display of different monitors. Package included: 1 x AT-VHD Aluminum Alloy Universal Clamping Shank Hand Drill