(click to enlarge) Type: Allen Wrench - Metric Series: profiTOOLS R/C Tools Tip size: 2.5mm Tip length: 120mm HUDY profiTOOLS are based on highly-successful HUDY Professional Tools used by RC factory teams and world champions. Each tool has a special, CAD-designed tip made of world-renowned HUDY Spring Steel� to very precisely fit the corresponding fastener, allowing unmatched torque and long life. New lightweight, comfortable molded hollow handles with machined hubs are designed to allow easy tip exchange.