Type: stone mound Standard:15t-20t Material: granite or ferroconcrete Number: 16 or 12 pieces Remark: take four as a group Type: stake Standard:?200mm*4m Material: pine or seamless steel tube Number: 16 or 12 Remark: calculate groups of four, and clump of stakes consist of three stakes in each one Type: high holding power anchor Standard: ?400kg Material: No.35 steel Number: 16 or 12 Remark: take four as a group