Drillpro Hexagon Screw Driver Screwdriver Set Hex Screw Driver Screwdriver Tools Kit for RC Helicopter Car 1.5/ 2/ 2.5/ 3mm 4 kinds of tip size for different needs: 1.5mm, 2.0mm, 2.5mm, 3.0mm. Item size: 1.9 x10.4cm (Diameter x Length) Easy to change the tip for use. Slip-resistant designed handle and optimal shaped drill for operation. Suitable for different kinds of RC helicopters,quadcopters ,airplanes, cars, boats, etc.