ROBERTSON Machine Screw 8-32 X 1-18 Truss Head

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Phillips screwdrivers; Torx screwdrivers; Hex screwdrivers; Robertson screwdrivers Flathead screwdrivers are used for screws with a single slot, while Phillips

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 Robertson Square Drill Bit Set Square Screwdriver Bit Sizes: #0, #1, #2, #3, and #4 : : Home

antelope slot canyon tours by chief tsosie 1 Overview · 2 Slotted drives Slot; Coin-slot · 3 Cruciform drives Cross; Phillips · 4 Square drives Robertson · 5 Multiple-square drives  Interestingly, although they were always sold at a premium price, it is actually easier to make Robertson screws than slots screws, as slots involve a punch for