Robertson Screwdrivers

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

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 dadunation Slot heads are rubbish to anyone who installs large numbers of fasteners and drivers on Phillips fasteners cam out very easily, usually making a

slot 800 In 1908, Canadian Peter Robertson invented a square-head screw drive where the driver and the hole had a slight taper There had been other