robertson screwdriver bits For Efficient Repairs And Crafting

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Types of Screw Drive · Slot head screws are driven by a flat-bladed screwdriver · Robertson drive head screws have a square hole and are driven

Until the square drive screw was invented, nearly all screws were slot head or straight drive screws Square drives, also known as Robertson Truss Head : low profile semi-elliptical top with flat bearing surface Combination Drive with Original Robertson® square and flatslot drive It is recommend

pg slot 918 wallet History of Square & Phillips screw drivers Back in the day of slots he contended that the hammer was the best screwdriver on Reason being that you cannot over torque a slot screw, your screwdriver will slip first With a Robertson you could crush the flange Pre