Big Head Slotted Oval Head Quarter Turn Fasteners with springs and plates. 10 each. Slotted oval head quarter turn fasteners is 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): 0.500 Material: Aluminum Finish: Anodized Black