This might be a precision-tooled magnetic bit designed for usage because of the TAMIYA Ratcheting Screwdriver PRO in Item 74152. It conforms to your Tamiya L size, which corresponds to 3-5mm (JIS M3-M5) plus head screws.
• (+) Screwdriver Bit L (Short) x1
• Bit size: PH2 x 55mm. Shorter shank helps when utilizing in tighter spaces.
• Precision crafted Chromium-vanadium metal.
• appropriate for Item 74152, and electric screwdrivers that can make use of 6.35mm hex shank bits.