4 Pack Pneumatic Silk Screen Stretching Clamps For Screen Printing With Hose TeeFeature:Chuck width: 30 cm, is the best tool to stretch 30 * 30 cm (11.8 * 11.8 inches) screen framePower: Pneumatic, saving time and energyMaterial: steel, rubber, high quality cylinderWeight: about 4 kg / pieceThe thickness of the upper and lower clamps is enough 16MM; the fact proves that the 16MM thick rubber strip clamps the net yarn more stably and firmly, and it is not easy to take off the net when pulling the net.Package Included:4 * Stretching clip1 * Air valve switch1 * Barometer1 * Hose1 * TeeWarm note: Some T joints and copper joints (as shown in the accessories picture)