GMT 3 Jaw Open Centre Power Chucks rotate at high speeds on CNC lathes. These are available in 135mm, 165mm, 200mm, 250mm, 315mm, 400mm and 500mm. We supply soft jaws as blanks. We offer serration: 1.5 x 60, 2.5 x 60, 3 x 60 on base jaws, hard jaws and soft jaws on request. Contact us for quote.