GRK Top Star Adjustable Shim Screws

Plumb Installation of Wooden Doors and Windows. No More Shims!

GRK Fasteners' adjustable Top Star™ shim screw is actually a screw within another screw, allowing you to install wooden doors or windows without needing any shims whatsoever.

• Recessed Star Drive: No stripping due to six points of contact
• 4-point 3/8" diameter threaded sleeve: Securely holds your wooden frame in position
• Micro-adjustments: Create an absolutely plumb installation
• Use with GRK's Top Star™ Crown and T-15 Star bit system
• White Zinc Plated: Lasting durability achieved
• For Shim Free installation: Wooden windows, doors, insulation, paneling, cabinets and built-in wall units

The quick and easy system created by GRK's Top Star Adjustable Shim Screws reduces labor and allows hassle-free adjustment for absolutely plumb installation. This fastener is best suited to meet the needs of professional contractors in the window and door trades. Fine tuning and adjustments are as simple as turning a screw, even after years of use and settling.