These cylinder-shaped, wedge type anchors can be installed in your existing floor and create a tie down frame stall for your shop in a jiffy! With a 3 1/2" concrete core drill, the 560-i's can be installed in existing floors and wedged into immovable position so you can work in almost any position around a damaged vehicle. The 560-I E-Z anchor is inserted into the drilled concrete and a special puller forces the square wedge securely into the cylinder. Since the wedge is larger than the inside diameter of the cylinder, the slotted cylinder walls expand against the concrete walls, locking the cylinder into the floor. A protective insert ring at the neck of the cylinder prevents chipping around the top of the cylinder. Once installed, the tighter you pull the tighter it wedges When the E-Z anchor is not in use, the chain drops into the cylinder, pulling the cover in with it and creating a flush with the floor flange! Wt: 7 lbs.