... QC12K1. The frame is steel-welded construction, vibrating to eliminate stress, withhigh strength and good rigidity. 2 ... adopts rolling ball screw, rollingguiding way, so it's positioning precision could reach 0.10mm. 6. ... E20,DA-250 and DA-350systemProduct parameters: what's your payment term? 30%T/T in advance ... free parts.if beyond one year,you need to buy by factory cost. QC12Y-6X3200 hydrauic swing ...