types of tower crane 1,ISO9001-2000 2,safe operation 3,easy to assemble 4,high quality and low price QTZ63 types of tower crane 1,Tip load:1t 2,max load:6t 3,max lifting height:120m 4,working range:3-56m5,Rated lifting moment: 630KN.m6,Jacking speed: 0.5m/min7,More specifications pls inquiry today! QTC63 types of tower crane