Nitro 22" 4" Duravanes Crossbow Bolts by Gold Tip. 6 Pieces. The Nitro Crossbow Bolt is a heavy hitter designed for today's fastest and most powerful crossbows. Recommended for draw weights over 175 lb or bows that require a 500 gr weight-range bolt. Features Gold Tip's legendary 100% Carbon Technology for unmatched durability and straightness retention.