Features 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 1/4 inch, which is convenient for installing standard size screwdriver bit, stable and reliable. Specification Item Type: Keychain Bit Holder Inner Diameter: 1/4in Material: Aluminum Alloy, ABS, Stainless Steel Total Length: Approx. 44mm / 1.7in Package List 3 x Bit Holders 1 x Ring Buckle