Untitled 2 PRODUCT INFORMATION Description The GRK Top Star Adjustable Shim Screws are made to be used when installing window and door frames, insulation and paneling, built-in wall units and cabinets. They are made specifically to reduce labor by allowing for fine adjustments in both directions. Installation Note: Step 1- Predrill jamb only with 5/16″ diameter drill.Step2 – Drive screw until outer screw is flush with jamb using Crown Bit (Not Included).Step 3 – Adjust inner screw using T20 TORX Bit (Bit not included). Note: These screws require a special crown bit to install (Sold Seperately). Features Recessed Star Drive: Zero stripping, with 6 points of contact 4-point 3/8″ diameter threaded sleeve: provides a secure hold in your wooden frame Micro-adjustments: allow for an absolutely plumb installation White Zinc Plated: finish for lasting durability For Shim Free installation: of wooden doors, windows, insulation, paneling, built-in wall units and cabinets Eliminates Shimming Fine adjustments are as simple as the turn of a screw, even after years of use and settling No Returns Accepted