A special design is cut into the head of the screw that the screwdriver will fit into when the screw is driven into a surface. This is called a drive. There are many different designs of drives.
21040
YminCully-Minerallac Screws21048
YminCully-Minerallac Screws86217
YminCully-Minerallac Hole Making, Hole Saw Series85014
YminCully-Minerallac Hole Making, Speedbor Wood Bit Series85011
YminCully-Minerallac Hole Making, Speedbor Wood Bit Series40018
YminCully-Minerallac Driver Tools, Cully Series86240
YminCully-Minerallac Hole Making, Hole Saw Series81818
YminCully-Minerallac Hole Making, Ship Auger Series81822
YminCully-Minerallac Hole Making, Ship Auger Series52165
YminCully-Minerallac Screws