Cheese Head. A cheese head has cylindrical sides having a flat disc best (much like a wheel of cheese) in addition to a flat bearing surface.
Binding screw heads are non-countersunk, which suggests that these heads https://safiyatiqe258423.qodsblog.com/28185322/how-much-you-need-to-expect-you-ll-pay-for-a-good-types-of-screw-heads