Robertson screwdriver

plural Robertson screwdrivers

1. CanadaA type of screwdriver having a square tip, designed to drive a Robertson screw.

   Robertson screwdrivers have colour-coded handles, to make it easy to determine which size you will require.

   2007, William S. Peckham, Michael C. Hammar, Never Hang Wallpaper With Your Wife: Decorating and Renovating From a Guy's Point Of View

   2 more examples

   The Robertson-head screw has a square hole in the head, made in three different sizes, and must be driven with a special Robertson screwdriver.

   1963, Alonzo Wass, Building construction estimating

   The Robertson screwdriver is among the tools found at hardware stores and building supply outlets across Canada.

   2002, Mark Kearney, Randy Ray, I Know that Name!: The People Behind Canada's Best-known Brand Names from Elizabeth Arden to Walter Zeller