SHDIATOOL 6 Inch Extension Rod for Core Drill Bits with 1-1/4 Inch UNC Thread

Quantity: 1pc only  Specification:  Shaft Size 6 Inch or 12 Inch Thread 1-1/4" UNC, 1-1/4"-7 male thread to 1-1/4"-7 female thread Shaft Size 6 Inch : Total length 200MM, Workable length 160mm Shaft Size 12 Inch : Total length 350MM, Workable length 300mm Application:  Work status for connecting with diamond core bits. Could be used for drill bits with 1-1/4" UNC thread. Feature： 1. Good quality steel, long life. 2. The shaft is hollow to allow water flow during wet applications.