Two M3 screws are at the bottom to prevent the camera from accidentally slipping, and the other two by the sides are spare screws for anti-defection. All the four M3 screws can be easily detached as required.
This plate can effectively prevent your camera from twisting. Just remove the M3 screws from the sides and securely fasten them into the top screw holes. (Note: This function is only for lenses with a single hole on their lens foot.)
2 Steps for Anti-deflection
Product Name: Arca type quick release plate
Product Type: HP80
Main Material: Aluminum alloy
Weight: 77g / 0.17lbs