7/16" Slotted Oval Head Quarter Turn Fasteners Slotted steel oval head quarter turn fasteners are available in various grip lengths and diameters to accommodate your needs. proudly manufactured right here in the USA. Head Type: Slotted Head Style: Oval Undercut: No Quarter Turn Fastener Diameter (in): 7/16 in. Quarter Turn Fastener Grip Length (in): 0.600in. Material: Steel Finish: Milled Weld Plate Non Dimpled Center For 1-3/8 Spring