GRK Fasteners 1/4-3/8 in. x 3-1/8 in. Recessed Star Drive Flat Head Top Star Door and Window Shim Wood Screw (100-Pack)

GRK Fasteners 1/4-3/8 in. x 3-1/8 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. The quick and easy system reduces labor and allows for 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 fit, shim-free installation.

• GRK topstar for installing wood window and door frames
• Adjustments allow for an absolute plumb installation
• Zinc-plated finish shim screw with star-head recess