We are manufacturer of rotary pneumatic cylinder. It is a special purpose cylinder with rotary connection & linear movement used for collet clamping. There are three models as per force requirement. It did not have any kind of stroke during the swings periods. specification:type: machine attachment material: aluminumbore of cylinder: 25, 32, 40, 50, 63 mm of diameterrotation angle: 0, 45, 60, 90 degree optionalfour optional swing angles: 0 45 60 90 degree.