Umbrella live center have following centers 1.high rigidity, high precision. 2.rolling type live center 3.Longlife quality Umbrella live center have following features:1.The thimble located berel ball bearing. 2.Suitable for CNC machine,high speed and light duty,waterproof and dustproof design. 3.The mandrel adopt alloy steel and heat treatment (HRC60° ± 2°) Super steel trait and durability. ...