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Product Description GRK's adjustable Top Star Screw substantially reduces labor when installing windows, door frames, insulation, paneling, built-in wall units and cabinets. This screw works great for both the professional contractor and do-it-yourself installers. Fine adjustments can be made in both directions, helping to reduce the workload and make the job easier for one person. From the Manufacturer GRK's adjustable Top Star Screw substantially reduces labor when installing windows, door frames, insulation, paneling, built-in wall units and cabinets. This screw works great for both the professional contractor and do-it-yourself installers. Fine adjustments can be made in both directions, helping to reduce the workload and make the job easier for one person.