this is the variation of your counter sunk screw head, even so the less than floor of The top is curved, like a bugle. This cuts down damage to plasterboard lowering tearing in the paper, so is typically found on drywall screws Arguably the commonest kind of screw head, you will find appreciable versions and mixtures of this sort. The only differ

The polydrive screw push, often called RIBE,[74] is spline-shaped with rounded finishes from the fastener head. The Software has 6 flat enamel at equivalent spacing; the measurements are determined by the diameter in the star factors. Hex screw heads are of two types—exterior and interior. External screw heads are hexagonal and protrude within t