Buffalo Broadhead Black Archery 2 Blades 100 Grain 2" Cutting Diameter (6 Pcs) length: 6.0cm/2.3inch The 2-blades broadhead has a 2.3-inch cutting diameter. This kind of broadhead was designed for use with bow draw weights in excess of 60 pounds. The new broadheads are easily recognizable by their black ferrule design. weight: 100Grain/6g.