Starborn Structural Lumber Pro Plug System

The Starborn Pro Plug System for Structural Composite Lumber brings hidden fastening to structural composite lumber connections, matching Starborn's structural wood system but engineered specifically for composite material. Plugs are made from the actual structural composite board itself, giving a true color and texture match rather than a generic filler. This kit uses the Black Exterior Grade Coating screw with a Tri-Forge point for faster, easier insertion and reduced splitting during installation. Installation (3 steps): Pre-drill the counterbore using the Pro Plug System Structural 22mm Forstner Bit, with the Smart-Bit Depth Setting Collar aligned to its second groove (both sold separately) Drive the appropriate structural screw fully seated into the hole — do not overdrive Tap the composite plug into place with a smooth, large-faced hammer until flush with the surface The system uses a T40 star drive on a flat head screw and is built for material 2" nominal thickness or greater. Follow the composite lumber manufacturer's specifications for screw spacing and edge/end distances. Key Features: Hidden fastening system for structural composite lumber connections Plugs made from actual structural composite board material for a true match Black Exterior Grade Coating with Tri-Forge point for easier insertion and reduced splitting Flat head, T40 star drive Kit includes matched screws and plugs; Forstner bit and depth-setting collar sold separately Designed for material 2" nominal thickness or greater Approved for ACQ/pressure-treated lumber; 316 stainless version available for saltwater environments