4 in 1 Replaceable bit Hex drivers for RC Helicopter, airplanes, car, boats... Tools Kit,1.5/2.0/2.5/3.0mm 
 
(1.5mm 2.0mm 2.5mm 3.0mm) (4 in 1)
 
Replaceable bits and 1 Handle: 1.5mm Hex Key, 2.0mm Hex Key, 2.5mm Hex Key, 3.0mm Hex Key,
 
Alloy Steel Materials——The screwdriver bits are made of high speed steel and heavy duty steel tips, Features Durable, Sturdy, Resistant to stripping breaking.