Top Star™ Adjustable Shim Screws

For Plumb installation of wooden doors and windows. No more shims!

Top Star™ Adjustable shim screw is a screw within a screw that allows you to install wooden doors or windows without the use of shims. The quick and easy system reduces labor and allows for a hassle-free adjustment to ensure plumb installation.

The 4-point top sleeve provides a secure hold into the frame, while the GRK Star Drive bit is used to make the adjustments needed for a perfect, shim-free installation.