Square drive is a type of fastener drive system that uses a square-shaped socket to engage with a corresponding square-shaped head on screws or bolts. This design allows for better torque transfer compared to traditional drives like Phillips or slotted, reducing the likelihood of stripping the fastener. Square drive fasteners are commonly used in woodworking and construction applications. The most common size of square drive is known as Robertson, named after its inventor, Peter Robertson. This system is particularly popular in Canada and is favored for its ease of use, as the square shape helps keep the screwdriver in place, making it easier to drive screws without slipping.