Type: Slotted Screwdriver Series: profiTOOLS R/C Tools Tip size: 4.0mm Tip length: 150mm Special tool for engine adjustment HUDY profiTOOLS are based on highly-successful Hudy Professional Tools used by RC factory teams and world champions, and are available in most popular sizes and types. 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. Lightweight, comfortable molded handles with machined hubs are designed to allow easy tip exchange. � most affordable professional tools with unmatched value � special composite handle with perfect handgrip design for unsurpassed grip and torsion � three different handle sizes for maximum torque � alu machined hubs for easy tip exchange � tips handmade from world-renowned top-secret Hudy Spring Steel� Hudy profiTOOLS are available in all sizes and various lengths, types, and measurements: � inch and metric hex and ball-hex drivers � slotted and Phillips screwdrivers