GRK's adjustable Top Star™ shim screw, is in fact 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.
Recessed star drive zero stripping, with six points of contact
Recessed star drive zero stripping, with six points of contact
Micro-adjustments allow for an absolutely plumb installation
GRK's adjustable Top Star™ shim screw, is in fact 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.
Recessed star drive zero stripping, with six points of contact
Recessed star drive zero stripping, with six points of contact
Micro-adjustments allow for an absolutely plumb installation
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GRK's adjustable Top Star™ shim screw, is in fact 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.
Recessed star drive zero stripping, with six points of contact
Recessed star drive zero stripping, with six points of contact
Micro-adjustments allow for an absolutely plumb installation
