The jacks are general hydraulic jacks which are mainly applied in group anchor stretching and pushing .With different accessories,the jacks can be applied to YJM15Y Grip Group Anchor,DM Button-heading anchor ,YGM Precision rolled Rebar Anchor LM Screw Bar Anchor and LZM Chill-cast Anchor for stretching of pre-stressing components in bridge ,slope ,high-rise building and waste water treatment facilities.