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The RC Screw Driver Bits Made of high-quality alloy steel, heat-treated, reduce wear and distortion, with excellent hardness and torque. Quick release hex shank driver bits (NOT 1/4 inch, NOT fit other driver handle), easy to install Diamond Designed Handle, Hollow Design, with Cap End, Offer Good Grip & Lightweight & Excellent Appearance The Allen Keys Bits Compatible with Traxxas Arrma Axial SCX10 SCX24 Tamiya Redcat Racing Cars, RC Quadcopter, RC Helicopter, Boat etc. Also can be used in other General purpose Gohobby Quality Guarantee- 100% custumers satisfaction warranty