The square shape of the recess permits a more secure fit and decreases the chance of damage to the screw head.
The head height is about half its diameter and usually has a slot drive. Its deeper slot ability makes it https://hamzahzzpu353565.theblogfairy.com/27793784/how-much-you-need-to-expect-you-ll-pay-for-a-good-types-of-screw-heads