GRK TOP STAR ADJUSTABLE SHIM SCREWS Window Door 3/8 in. x 3-1/8 in. Recessed
GRK Fasteners 1/4-3/8 in. Top Star shim screw is a screw within a screw that allows you to install wooden doors or windows without the use of shims. GRK TOP STAR ADJUSTABLE SHIM SCREWS Window Door 3/8 in.