This might be a precision-tooled magnetic bit designed for usage aided by the TAMIYA Ratcheting Screwdriver PRO in Item 74152. It's to be used on 2mm hex head screws.
• (+) Screwdriver Bit L (Short) x1
• Bit size: 2x100mm
• Precision crafted Chromium-vanadium metal.
• Compatible with Item 74152, and electric screwdrivers that will make use of 6.35mm hex shank bits.