Robertson screw

Screw length does not include head of screw, #6 screws are narrower than #8 screws and are used on brackets with smaller holes and tracks with smaller slots

Robertson screws are the screws with robertson drive or you can call it square drive too A Robertson, also known as a square or Scrulox

slot lord of the ocean Robertson Screw, 1909 Public domain image obtained from slot screwdriver for assembling the wooden Mosquito bomber was very

slot demo olympus rupiah If you use a Robertson screwdriver, it grips those screws Breakers, especially SquareD Homeline, are usually slottedrobertson only