These are adjustable “screw-in-a-screw” screws used to install wooden doors and windows without needing separate shims. They allow precise leveling of the frame even after installation, saving time and reducing manual effort.
Key Features
Shim-Free Installation: “Screw-in-a-screw” design eliminates the need for traditional wood shims.
Precise Adjustment: Micro-adjustments allow perfect leveling of frames.
Easy to Use: Single-person installation is possible.
Star Drive System: Prevents driver slippage and screw head damage.
GRK Compatible: Works with Crown bit and T‑15 Star bit for adjustment.
Multi-Purpose: Also suitable for insulation panels, cabinetry, and wall units.