GRK Crown bit is the two-part drive system used with the GRK Top Star. The larger outer "crown" will drive both parts of the Top Star into the application. When you're ready to adjust the window or door frame, remove the "crown" and insert the remaing drive bit into the Top Star. Now only the "lag" portion of the Top Star will turn - in and out. This movement is like using a shim to either increase or decrease the gap between members.
Product Videos
GRK Top Star Shim Screw (00:34)
CLICK HERE :- http://www.grkfasteners.comTop Star Shim Screw How-To Video
GRK Top Star S...
CLICK HERE :- http://www.grkfasteners.comTop Star Shim Screw H...
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