Heater Body Suit Nightmare Xtreme Crossbow Bolts .003in Pack of 6 Black. The 20 inch bolt design balances speed and penetration while maintaining stability at high velocities. Each bolt is built with tight straightness and weight tolerances to support repeatable accuracy. Inserts and half moon nocks come installed for ready-to-use setup and reliable compatibility with crossbows rated up to 500 fps. Specifications for Heater Body Suit Nightmare Xtreme Crossbow Bolts: Manufacturer: Heater Body Suit Color: Black Quantity: 6 Pack Weight: 384 grain Shaft Length: 20 in Nock Type: Half Moon Fabric/Material: Carbon Archery Application: Hunting Features of Heater Body Suit Nightmare Xtreme Crossbow Bolts 100 percent carbon bolt construction Bolt length: 20 inches Half moon nocks installed Straightness tolerance: +/- .003 inch or better Weight tolerance: +/- 2 grains Inserts included and installed Bare weight: 284 grains Total weight with 100 grain tip: 384 grains Tested for crossbows up to 500 fps Package Contents: Heater Body Suit Nightmare Xtreme Crossbow Bolts Heater Body Suit NXCX300gr: Nightmare Xtreme Crossbow Bolts .003in Pack of 6 Black