The ProMediaGear Photographers Keychain Multi-Tool gives you two essential tools with a convenient way to carry it. One side has a 5/32" (4mm) Allen wrench that fits the most popular mounting screws and the other a basic flat-head screwdriver to tighten and loosen most slotted screws. Made of hardened and polished 540 stainless steel, the multi-tool will hold up to daily use and supply all the torque you need to secure your gear. Its 1" split ring can be used for your keys or to attach it to zipper pulls on bags. In a pinch, the screwdriver can be used to open boxes with ease or open a refreshing beverage at the end of the day.