... shoulder punch 1.surface finish better than 0.005mm 2.roundness tolerance down to 0.002 or lower Product name shoulder ... material: SKD11,SKH9,SKH51, SKH553)technique standard : according to national standard GM, JIS,DIN,AISI ect, and ... utilization scope : precision punch mold, precision plastic mold, precision auto mold, precision medical mold, precision computer connector mold and other factory ...