Features 1、This set contains 6 different pieces cutter hea-d, which meets your different needs. 2、Made of manganese steel material, the drain cleaner combination is sturdy and durabl-e and easy to operate. 3、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. 4、Fit Spring: There are two small holes under the hea-d of the knife, which can be fit directly with the spring. 5、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. Specification 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: 105*58*29mm/4.13*2.28*1.14in Package Weight: 205g/7.23oz Packing List: 6*Cutter Head 1*Ke-y Package List 6*Cutter Head 1*Ke-y