Fastener Head Style- 12-Point. Thread Size 7/16-20 Inch. Rh. Under Head Length 0.725 Inch. Fastener Tensile Strength 200000 Psi. ARP Pro Series Flexplate Bolts Are Far Superior To Oem Hardware. Forged From Aerospace Alloy And Heat-Treated Prior To Thread Rolling And Machining They Feature An Exclusive Flat 12-Point Head Design And A Larger-Than-Stock Shank Diameter For Increased Strength And Improved Register.