ISPORT 5/16 77grain Glue on Field Points Water-Drop Shape Archery Arrow Replacement Practice Tips 12pcs Glue on field point for wood arrows, bamboo arrows, fiberglass arrow, carbon arrows ect. Diameter: 5/16 inch, lenght: 1.45 inch, Weight: 77 grain(5g) Arrow Components, fit for arrows with inner diameter 8mm Archery Broadheads Points 77 grain for Target practice 12 Field Points per Package.