An exterior hex screw head is also called a hex head cap screw. The screw head is made up of the six-sided fastener. There are numerous mixture-style screw heads having a slotted screw head from the middle with the hex head cap. SHARESScrewdrivers are on the list of first tools https://types-of-roof-tile94822.gynoblog.com/28910873/5-easy-facts-about-types-of-screw-heads-for-screwdrivers-described