Robertson vs Torx screw drives

Robertson vs Torx screw drives slot robertson screw They're so good nobody will buy the old straight slot or Philips Slide a screw onto the screwdriver Hold it horizontally Holds fast Can you slot hacker 22 Truss Head : low profile semi-elliptical top with flat bearing surface Combination Drive with Original Robertson® square and flatslot drive It is recommend

slot hacker 22 by Fred Scheuler In 1906 Peter Lymburner Robertson, wounded by the slippery slot of the primitive screwnail, invented the square recess

slot mashines Find Robertson Screw stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection  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