Our machined Steel Field Points (AKA field tips) are extremely durable and made with precision in mind to help with accurate arrow flight. Stamped on the outside with diameter and grain weight for easy identification. Choose a diameter to best match your shafts Outside Diameter (OD) the best. If in-between size, a smaller point will have less wear on your targets. Our screw-in steel field points are designed to fit all carbon and aluminum arrows as they have an industry standard 8-32 thread. This is the same thread used by all arrow inserts (except Easton Deep Six). The 9/32" diameter in 125-150 weights have a bullet nose tip. While all other diameters and weights feature a special contoured shape for accurate shooting, extended target life, and durability. Choose point diameter of 9/32", 5/16", 21/64", or 11/32" in weights listed in chart. Sold by the dozen and hundred count. Please specify. SCREW-IN POINT CHART Point Weight 9/32" 5/16" 21/64" 11/32" 100 grains X X X X 125 grains X X X X 145 grains X X X 150 grains X X X 175 grains X X X X TECH TIP: For determining the point diameter of aluminum shafts, take the first two numbers of the model and divide by 64. Example 2018 = 20/64" or 5/16".