Thread type shank rod

Thread type shank rod Product description : shank size is 22 x 108mm, and drill rod end connect bit with thread way.Normally R22,R25,R32 for small hole. We manufacture shank end rods in the following threads:R22, R23, R25, R28, R32 mainly focus the stone quarrying such as granite, marble, limestone, sand stone quarries drilling , diameter of hole range from 38mm-50mm at most, Prodrill use the following special heat treament techology to process Carburization is a process used