Feature:1. INCLUDED TOOLS: Includes 3pcs keychain extension rods, equipped with a ring buckle, which is compact, convenient for installation and carrying.2. RETRACTABLE INSIDE: These extension rods are retractable inside, can be installed with long and short drills, cutters, etc., which is convenient and practical.3. DURABLE MATERIAL: These keychain extension rods are made of aluminum alloy, ABS and stainless steel, which are wear resistant and corrosion resistant.4. PORTABLE DESIGN: These extension rods are designed with keychain, and can be well fixed, suitable for high altitude or field operations to avoid tool loss.5. STANDARD SIZE: The inner diameter of the bit holder is 1 or 4 inch, which is convenient for installing standard size screwdriver bit, stable and reliable.Specification:Item Type: Keychain Bit HolderInner Diameter: 1 or 4inMaterial: Aluminum Alloy, ABS, Stainless SteelTotal Length: Approx. 44mm or 1.7in.Package List:3 x Bit Holders1 x Ring Buckle