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Bottom: PB21modelS characteristics:S DB21 series motherboard is used to adjust frame fixed on the workbench surface or combination of a variety of installation and adjustmentS double chute structure, another layer after layer of fixed can move relativelyS norms diversity, flexible choice. Compared with the ordinary floor, it is more convenient to useS adjustment range of + / - 13 mmS weight 0.35 kgPB21