This type screwdriver, Phillips screwdriver or the tip of the mouth to make a four-pointed head through a twist to the normal pressure on the screwdriver handle to keep triangles than the screwdriver out of the groove .
This type of screwdriver screwdriver at the end of section-headed mouth or mouth after surgery will head a four-headed twisted time will need more than an ordinary screwdriver press the butt to make a square of the screwdriver out Groove .
This type of cross-head screwdriver at the end of the Torx screwdriver or the nature and prisms to split the head of a Phillips time twist will have to apply pressure on the handle more than a screwdriver to plain of a hexagon screwdriver out of Groove