This part 10321503 is a nose piece used to install heavy duty metric inserts. We strongly recommend to switch to the Clinserts Tool part number: CLPHTM5x0.8 .We recommend to use the hydro pneumatic tools CLPTC-1 or CLPTC-2 or the electric Powertools. CLPTC-1 CLPTC-2 .Electric Powertools: CLEPT1 or CLEPT2