aluminum materials, practical and 1 / 4-inch quick shank and 1 / 4-inch socket fit most electric, hand-held and bits You can also use the keychain post with your favorite carabiner according to your needs ( Screwdriver bits holder only, other accessories demo in the picture is not included This keychain has a flat, thick and round design, which makes it easier to take the product and change the bit with hand Compact and portable, easy to carry around Suitable for drill, screwdriver, batch for head and other to transfer, Manufacturer: HVRFJXI