Lumenok Cap Capture Lighted Crossbow Nock HD Orange 3-Pk. They are made to fit bolts that are .300in on the ID. Nocks weigh 28 grains Specifications for Lumenok Crossbow Capture Nock: Manufacturer: Lumenok Condition: New Quantity: 3 Features of Lumenok Crossbow Capture Nock Fits bolts that are .300in on the ID. Nocks weigh 28 grains Parker Red Hot Bolts (by Gold Tip) Gold Tip bolts .300in ID Lumen-Arrow bolts Black Eagle bolts Bloodsport Bolts Victory bolts Element Bolts Each has a replaceable battery (Lumenok RBS) Package Contents: Lumenok Crossbow Capture Nock Lumenok CAP3: Cap Capture Lighted Crossbow Nock HD Orange 3-Pk