This is a variation of the counter sunk screw head, however the less than surface area of The pinnacle is curved, similar to a bugle. This reduces damage to plasterboard reducing tearing of your paper, so is usually identified on drywall screws they've uniform threads, and are sturdy with a greater torque power. What this means is you will need a

With this classification there are several screws which involve specific type of screwdriver for their installation. The TA is actually a form of screw drive that employs a triangle-shaped recess in the screw head. This drive can prohibit access to the machine internals but can quickly be driven with hex keys. These screws will often be present in