7/16" Self Eject Allen Head Quarter Turn Fasteners Self eject slotted quarter turn fasteners by are available in various grip lengths and diameters to accommodate your needs. They are aluminum alloy anodized black finish.manufactured right here in the USA. Head Type: Slotted Head Style: Flush Undercut: No Quarter Turn Fastener Diameter (in): 7/16” in. Quarter Turn Fastener Grip Length (in): 0.500 in. Material: Aluminum Finish: Anodized Black