Elveator link is a kind of necessary lifting tool in petroleum well drilling operation. Single-arm flying ring is made up of high-strength, and high toughness alloy structure subject to whole-body forging, special heat treatment, surface reinforcement and nondestructive flaw detection. It owns merits of being wearable, long service period, and safe and convenient operation, etc. Main parameters Model DH150DH250DH350DH500DH750Rated load of a pair of flying rings KN (us ton) 1335(150)2225(250)2670(300)4450(500)6675(750) Main dimensions (mm) 1 8002 7003 3003 6003660Empty weight of a pair of rings (Kg) 1663825689461440