A socket button head screw attributes an uncovered rounded head with an inner allen essential travel. Like socket cap heads They may be utilized on apps where by an allen crucial is utilized to tighten/loosen. The JIS screwdriver is a cruciform, like Phillips, but is intended to resist camming out. https://fernandopgviw.bloggerswise.com/36015896/fascination-about-types-of-screw-heads