This is certainly a precision-tooled magnetic bit made for use aided by the TAMIYA Ratcheting Screwdriver PRO in Item 74152. It conforms towards Tamiya L size, which corresponds to 3-5mm (JIS M3-M5) plus mind screws.
• (+) Screwdriver Bit L (Short) x1
• Bit size: PH2 x 55mm. Shorter shank helps when working with in tighter spaces.
• Precision crafted Chromium-vanadium metal.
• Compatible with Item 74152, and electric screwdrivers that will utilize 6.35mm hex shank bits.