Details
GRK's shim screw - the Top Star™ - substantially reduces labor for the installation of window and door frames (jambs), insulation, paneling and built in wall units/cabinets. The Top Star™ is ideal for all adjustment applications.
Our product is perfectly suited to meet the needs of both the professional and do-it-yourself installers.
Fine adjustments are possible in both directions helping to reduce the workload and make the job easier for one person.