Platte River 110008, Wood Specialties, Buttons & Plugs, 3/4" Birch Flat Head Plugs, 100-pack End grain plugs have a tapered shape for a snug fit. Specifications: Height=1/4 in, Hole Diameter=3/4 in, Outside Diameter=3/4 in Specifications: Species=BIRCH, Taper=1 degrees