Chock for Coal Mines is available for providing support to a much larger stretch. It is a combination of sleepers placed above one another. These sleepers are arranged in a crisscross manner. It is used in places where the roof needs a substantial support. In addition to this, it is also used at goaf edges and at junctions of galleries. This Chock for Coal Mines is tightened against the roof at a convenient height using hammer. Its removal is also easy by just loosening the wedges and sleepers. As per the demands, it can also be erected in between four corner props.