But there must be a space of not less than 100. Square centimeters The head of the tripod must be forming or prepare a hole drilling success to obtain slabs or beams below.(Stringer)
It has an area of at least 100. Square centimeter The head of the stand will be prepared forming holes or achievement to get the slabs or beam (Stringer).
But the area is less than 100 square centimeter. The head of the tripod to forming or prepared hole success to receive the slabs or lower beam (Stringer).