The Robertson screw

Robertson A Robertson screw, often referred to as a square or Scrulox screwdriver, has a square-shaped slot in the screw head and a

The Robertson screw  Robertson Screwdrivers Features 3 component handles provides a maximum comfort grip; Size is shown on blade and tip style is shown on handle for

Robertson A Robertson screw, often referred to as a square or Scrulox screwdriver, has a square-shaped slot in the screw head and a

slot dove si compra il bonus ROBERTSON SCREW APPLICATION FILED OCT 24, 1907 Patentd Nov 8; 1910 ' UNITED STATES PATENT OFFICE

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

slot joker roma 8pcs Robertson screwdriver, there is a size to fit every type of Robertson screw

The screws were the slotted-Phillips combo variety The slot was too shallow for any torque with a flat head and the Phillips was utterly