A Robertson bit, also called a square drive bit, is a screwdriver bit with a square-shaped tip that fits into square-recess screw heads. It provides better cam-out resistance than Phillips drive.

R1 (yellow) fits #5 to #9 screws. R2 (red) is the most common size and fits #8 to #12 screws. R2 is standard for most deck and construction applications.

Robertson bits drive square-recess screws found in deck screws, pocket-hole screws, cabinetry hardware, and some general construction fasteners.

The square geometry of the Robertson recess creates four flat contact surfaces that transfer torque straight down without the wedging action that causes a Phillips bit to jump out under load.

Robertson drive is standard in Canada and increasingly popular in the US, especially for deck screws, pocket-hole screws, and fine woodworking applications.

Yes. Our Robertson bits have a standard 1/4 inch quick-change hex shank that fits all cordless drills, impact drivers, and drill/drivers with a standard bit holder.

1-inch bits are used for standard fastening where access is easy. 2-inch bits reach into deeper countersinks and tight spaces and are preferred for pocket-hole joinery.

Stripping can occur if the wrong size bit is used or if excessive side pressure is applied. Use R1 for small screws and R2 for medium to large screws, and apply steady downward pressure during driving.

Bit life depends on use frequency and material hardness. Quality steel Robertson bits last through hundreds of fasteners in softwood but wear faster in hardwood or when used with an impact driver at maximum torque.