Glass is fixed and held by pneumatic unit. The hole is drilled by upper and lower drill bits successively. It is equipped with a pneumatic table, which supports large size glass. The distance between the center of drilling hole and vertical column is 1230mm. High efficiency and easy operation. Drilling hole diameter: 3mm-220mm; Glass thickness: 3mm-30mm; Occupancy: 1.65m X 2.6m.