DNA Motoring HP-GN Security Hood Pins+Bolt+Locks Secure Engine Bay and Add a Positive Lock on Vehicles' Hoods. Give a Stealth, Consolidating and Smooth Racing Look. Made with Lightweight Powder-Coated Aluminum for Strength and Durability For Using with Carbon Fiber or Fiber Glass Hoods for Security Purposes To be Used in Conjunction with Factory Hood Latch Assembly.; 1.50" Flat Surface Diameter