The JK is manufacturing a range of Jacking Units, to cover the entire range of Prestressing Systems; with Mono-Strand and the Multi-Stressing System. The JK-Range Jacks are designated as Central Hole, Twin Cylinder Double Acting Hydraulic Jacks. The Main Jacking Unit has a to-n-fro moving piston and is used as Stressing Cylinder. Strands are being anchored at the rear end of the Piston with the help of specially designed Anchor Plate and self releasing Conical Grips. Another Jacking Unit located at the front end, is a hollow cylinder Single Acting Hydraulic Jack and is used for blocking purposes. Depending on the tendon type and the available spaces; a complete range of Jacks are available.