Fangrui Product Details 1. High Quality Material: This Firewall Pass-through Bracket Is Made Of 6061 Aluminum Alloy And Cnc Machined, The Is Anodized For Resistance And Durability. 2. Anti-friction: The Wire Harness Holes On The Firewall Pass-through Bracket Are Curved To Minimize The Damage Caused By Friction On The Wire Harnesses, And Not Damage The Wire Harnesses Even After Prolonged Use. 3. Functionality: This Bracket Allows For The Safe And Easy Pass-through Of Your Vehicles Wiring System Through The Firewall. 4. Easy Installation: This Is A Two-piece Design, The Top And Bottom Halves Are Bolted Together With The Center Bolt, And Then The Bracket Is Secured To The Car With The Remaining 4 Bolts. You Can Remove The Top Half Of The Bracket So There Is Enough Room To Install Or Remove The Wiring, Then Just Bolt It Together And Reinstall The Car Bracket Bolts. Fitment:for Terminator X Max Firewall Pass Through - Eliminates Gromet In Fire Wall - Bulkhead Wiring Harness Hole: 1 1/8inch Hole And A 3/4inch Hole External Dimension