Please purchase the item according to the manufacture part number

• Stage 8 Locking Fastener Kit.
• 4 x M10x1.25 Nut & Locking Kit.
• Stage 8 Locking header Bolts easy to use and they are real assurance against horsepower loss or gasket failure created by loose nuts or bolts. The unique patented and trademarked functional design is just three pieces: a bolt (4130 Alloy Steel), a locking retainer and a spring clip. The header bolt kits are application specific as either hex head with a 3/16 recessed allen head or 12 point, USA or metric. All Stage 8 Locking Header Bolt Kits are sold with all of the necessary hardware for your application.
• Retainers are 5052-H32 Polished Aluminum.
• Snap Rings & Clips Are Spring Steel.
• Clips Are Plated With Duplex Nickel Finish.