Arrow Diamond Tipped Calcium Cutter Category_Default Category Products Industrial Vacuum Equipment it is a top manhole Category_Default Category Products Sewer Rod and Rodding Equipment Powerdrive Trailers it is a top manhole roller guide made out of aluminum with a delrin roller over which you lay your hose on to guide and protect the sewer hose from rubbing against the rim of the manhole They are made of cast aluminum with one side being a double closed circle with an internal rubber gasket to protect the poles It has a tapered front arrow point that divides into 4 fins to start in the middle of the deposits Each of the 4 tapered fins has ¼” thick diamond segments brazed to the steel