Description: With a not completely empty interior and a large diameter flat ring, this bit extension holder is easy to mount on short bits, long bits and chain snaps. It is a flat, thick and rounded bit extension holder, which provides easy one-handed access to and replacement of the drill. This bit extension holder is constructed of aluminum alloy material. The diameter is 15mm and the length is 35mm. This bit extension holder is suitable for drill, screwdriver, batch head and other to transfer. Item Name: Bit Extension Holder Material: Aluminum Alloy Features: Hex Shank, Flat-mouth Ring, Large-diameter Size Details: Diameter: 1.5cm/0.59"(Approx.) Length: 3.5cm/1.38"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: Red/Golden/Blue/Green/Black: 1 x Bit Extension Holder or Multicolor: 5 x Bit Extension Holder