1/4 in. x 3-1/8 in. Adjustable Screw 100 Piece

Top Star Adjustable shim screw is 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 a hassle-free adjustment to ensure plumb installation. The 4-point top sleeve provides a secure hold into the frame, while the GRK Star Drive bit is used to make the adjustments needed for a perfect, shim-free installation.