Which style of fastener head is flat and has a deep slot for driving power?

A cheese head fastener features a flat top and a deep slot designed specifically for driving with a flat-head screwdriver. This design allows for greater torque transfer because the deep slot provides a better grip for the screwdriver, reducing the likelihood of stripping the head compared to shallower slots. The flat top of the cheese head contributes to a lower profile, making it suitable for applications where space is limited. Additionally, its design minimizes the risk of catching on other objects, which can be especially beneficial in environments where clearance is a concern.

In contrast, a hex head is typically designed for use with a wrench or socket rather than a screwdriver, a socket head is designed for Allen wrenches, and a truss head has a rounded top that may not provide the same mechanical advantage for driving as a cheese head.