Features: This set contains 6 different pieces cutter hea-d, which meets your different needs. Made of manganese steel material, the drain cleaner combination is sturdy and durabl-e and easy to operate. Easy To Install: It is easy to be installed on the dredging machine and the blad-e can be easily removed by a ke-y insert the small hole. Fit Spring: There are two small holes under the hea-d of the knife, which can be fit directly with the spring. This is a set of cutter hea-d for dredging machine. A replacement of the drain cleaner, easily washed away the toilet or pipes plug, quickly open up the hair, grease or vegetables caused by blocking. Specifications: Material: manganese steel Color: black Collet diameter: 16 mm Fit For: dredging machine Package Size: 1055829mm/4.132.281.14in Package Weight: 205g/7.23oz Packing List: 6Cutter Head 1Ke-y