Kreg Tools SSW Screw Selector Wheel for Kreg Jig K3, K4, K4MS, K5, and R3 KREG Tools SSW Kreg Screw Selector Wheel. Woodworking The Screw Selector Wheel makes it easier than ever to build projects with Kreg Joinery"!. Just dial in the thickness of each piece to be joined whether those thicknesses are the same or different and the Wheel shows you the correct screw length and Kreg Jig setting. Two-sided: shows face joints and edge joints Works with 1/2", 5/8", 3/4", 7/8", 1", 11/8", 11/4", 13/8", 11/2" (12mm, 16mm, 19mm, 22mm, 25mm, 28mm, 31mm, 35mm, 38mm) material Compatible with Kreg Jig K3, K4, K4MS, K5, and R3