Flat Signature Series Bolt Covers

NEW HEX ID DESIGN — A BETTER FIT. A STRONGER HOLD.

MORE PHOTOS COMING SOON

EFFENFAST Billet Bolt Covers have been upgraded with our new Hex ID design, replacing the previous round internal profile.

The precision-machined hex interior is designed to better match the shape of the bolt head, creating a more secure and precise fit. The result is improved alignment, increased contact, and better retention—helping keep your EFFENFAST Bolt Covers securely in place.

Why the New Hex ID Is Better

BETTER FIT
The internal hex profile provides a more precise fit around the bolt head for improved alignment and seating.

STRONGER HOLD
More contact with the fastener helps increase retention and reduces unwanted movement caused by vibration and use.

CLEANER LOOK
The improved fit keeps the cover centered and seated properly, giving your build a cleaner, more finished appearance.

PRECISION MACHINED
Like every EFFENFAST Bolt Cover, the new Hex ID design is precision CNC machined from premium 6061 aluminum for the fit, finish, and durability EFFENFAST is known for.

UPGRADED FROM THE INSIDE OUT
It may look like a small change, but the new Hex ID makes a big difference where it matters—fit, hold, and performance.

EFFENFAST — COVER YOUR NUTS.

How It Installs

Slip the cover over your existing bolt head and secure with the included set screw. Simple and non-destructive — no drilling or modification required.

Perfect For

• Engine bays
• Chassis hardware
• Underbody accents
• Show & performance vehicles
• Detail-oriented builders
• Architectural aesthetics  

Fitment

Available in a range of popular bolt sizes — check the size of bolt head with a wrench or socket for proper fitment.

DISCLAIMER- Parts Are Raw Machined Finish. No Processing Has Been Done. May Have Minor Imperfections. For best results rub your favorite metal polish to remove grease and solvent for an almost polished finish before install. We recommend Blue Loctite

www.P65Warnings.ca.gov