Four M Technologies [P] Limited manufactures Hexagonal Body Clamping Cylinders. Four M Technologies [P] Limited also manufactures various types of hydraulic cylinders and hydraulic modular fixturing systems. The Hexagonal Body Clamping Cylinders are used in fixtures. The Hexagonal Body Clamping Cylinders are single acting and spring return and may be threaded directly into tapped holes of the fixture. These Clamping Cylinders have corrosion resistant cylinder body.