Drive Types

                           Phillips

     The standard drive type for most screws

                         Abbreviated PH

                         Freason

Similar to Phillips. Rquires a Freason driver for installation

                       Slotted

              A slot in the head. 

              Abbreviated SL

                  Combination

A combination of slotted and Phillips drives. Abbreviated Combo.

                 Socket, Hex or Allen

A hexagon hole for use with an Allen wrench.

                       One Way

Installs with a normal slotted driver but can not be removed without special tools.

                        Square

     As known as Robertson drive. 

     Abbreviated SQ or SD. 

                   Star, Six-lobe

As known as Torx. A six-pointed star pattern. Specially designed to prevent cam-out and stripped head.