Easton 9mm Crossbow Bolts 22 in. Aluminum Insert Flat Nock 36 Pk Black. The 9mm Bolt has an inside diameter of 0.300" and will fit universal bolt components. Specifications for Easton 9mm Crossbow Bolts Aluminum: Manufacturer: Easton Color: Black Features of Easton 9mm Crossbow Bolts Aluminum: High-strength carbon construction Inserts are included with fletched bolt Shaft weight: 8.9 gpi BTV Vane: 10 grains 9mm Crossbow Insert: 61 grains Package Contents: Easton 9mm Crossbow Bolts Aluminum Easton 30059: 9mm Crossbow Bolts 22 in. Aluminum Insert Flat Nock 36 Pk Black