NIGHTMARE XTREME Crossbow Bolts Carbon Half Moon Nocks 6Pcs 20"This bolt features a balance of speed and penetration. It is the perfect crossbow bolt for all hunting situations. Constructed of 100% Carbon, which gives the Nightmare Xtreme unmatched quality and straightness shot after shot. Straightness Tolerance: + . 003" or better Length of 20" Weight Tolerance: + 2 gr Inserts included and installed Red Half Moon Nocks Included 284gr bare 384gr with 100gr tip Tested to speeds 500fps and lower