M4 x 12 Countersunk Head Allen Screw
High Tensile Countersunk Head Allen Key Self Colour Black Screws
Metric Threaded Screws, Various lengths from 5 to 60mm, M3, M4, M5, M6, coming soon M8 and M10,
Countersunk Head Screws
This is a type of cap screw with a hexagonal recessed drive.
Other head designs include Socket Cap, Button head and Countersunk head, the latter designed to be seated into countersunk holes.
A hex key (sometimes referred to as an Allen wrench or Allen key) or hex driver is required to tighten or loosen a socket screw.
Socket screws are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket.