Robertson Square Head Screwdriver Bits

website slot robertson screw Slotted screws are the simplest type of screw, consisting of a single slot at the head of the screw I personally prefer Robertson screws for woodworking slot 10k Truss Head : low profile semi-elliptical top with flat bearing surface Combination Drive with Original Robertson® square and flatslot drive It is recommend

slot robertson screw This zinc-plated, round head machine screw has a squareslot drive and a size three driver It is 12-24 x 12 inch and available in a box of 100   The square-head screw was invented by P I Robertson, a Canadian, in 1908 It offered a big advantage over the slotted screw head because  8pcs Robertson screwdriver, there is a size to fit every type of Robertson screw

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