The HS-57 is a heavy-duty skid steer attachment that removes the collar and surrounding area of concrete and asphalt encasing manhole covers. The HS-57 drastically reduces the hours required to repair manhole covers to minutes; typically 10-20 minutes in concrete and twice as fast in asphalt.
The Hydraulic Clamping Mechanism is the bottom portion of the HS-57 Manhole Saw.
The extractors move in and out using hydraulic pressure and are what clamp onto the lip of the manhole collar to pull it out of the ground. They extend out to 29 1/2" wide to fit most manholes. Check your specs to see if this will work for the job you're doing.
See more info about Purchasing a Coneqtec HS-57 Manhole Saw