.450 Grip Big Head Dzus Button Big Oval Head Steel 7/16".450 Grip Panelfast Big Head Slotted Oval Head Quarter Turn Fastenersslotted Oval Head Quarter Turn Fasteners By Panelfast Are Available In Various Grip Lengths And Diameters To Accommodate Your Needs. They Are Available In Steel Or 7075 Aluminum Alloy And Available In Either Milled Or Anodized Black Finish. Panelfast Is Proudly Manufactured Right Here In The Usa.Head Type: Slottedhead Style: Ovalundercut: Noquarter Turn Fastener Diameter (In): 5/16” In. And 7/16 In.Quarter Turn Fastener Grip Length (In): 0.400 In. – 1.000 In.Material: Steel And Aluminumfinish: Milled And Anodized Black