GRK Adjustable Top Star 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 hassle free adjustment to ensure plumb installation. The Top Star's highly engineered system can be used for installation of wooden doors, windows, insulation, paneling, wall-units, and cabinets.
Ideal for plumb installation of doors, windows or cabinets
Eliminates the need for shims
Recessed Star Drive: Zero stripping, with 6 points of contact
4-point 3/8 inches diameter threaded sleeve: provides a secure hold in your wooden frame
Micro-adjustments: allow for an absolutely plumb installation
White Zinc Plated: finish for lasting durability
Limited lifetime warranty
