[Features] · For drilling holes in steel sheets and stainless steel with thickness up to 35 mm / 50 mm. · Uniquely developed special blade shape. · 35SQ: Capable of machining steel sheet up to 35 mm thick and holes up to 35 mm in diameter. · 50SQ: Capable of machining steel sheet up to 50 mm thick and holes up to 65 mm in diameter. · Uses a center pin system. · Positioning is easy, and the core automatically ejects after punching is complete. · Effective in a wide range of fields including bridges, construction, can manufacturing, shipbuilding, and plants. · Using a dedicated shank, it can be used with magnetic drilling machines, upright drilling machines, radial drilling machines, lathes, and milling machines.