Includes: 8 1/4-20 Threaded bolts, 4 star knob and 4 Skeleton Knob kits, 8 washers, 1 storage box. VERSATILE APPLICATION: Fits any universal and double cut T-Track, helping to secure a variety of clamps and fixtures while optimising your favourite T-Track assembly. Durable: T-Knob package includes plastic knobs made of polypropylene plastic, bolts and washers made of steel for corrosion resistance, strength, rigidity, abrasion resistance and recyclability. Specifications: Star knob kits diameter is 1.45 inches, height is 0.68 inches (3.7 cm x 1.68 cm), threaded knob is 1/4 inch (6.35 mm) in diameter with 20 threads per inch. EASY TO USE: Simply insert the T-bolt head into the rail with a washer and align it with the threaded knob. These woodworking jig knobs can easily be used to enhance a variety of applications including miter gauge or T-track fences, stop blocks, featherboards and more. Knob Kit