Use is mainly used for large Assembly platform, large floor plates, assembled large adjustments at the platform level, enable multiple platforms can be adjusted to a flatness, better than horn tone, easy and difficult to change. Pressure of the ground anchor large anchor platform surface area smaller. Original of adjustment bolt, it on platform of surface damage area big; to anchor device raised, and Xia pressure adjustment up special convenient; to anchor device can for times adjustment, because platform of using frequency compared high, platform itself precision certainly will reduced, then we can at any time with to anchor device to adjustment precision, and General of adjustment bolt most fatal of shortcomings is once platform precision appeared deviation will cannot with it for two times adjustment.