... more than 15years experience in this line. 1.The Material for Hss Drill Bits have Hss4241,Hss4341,Hss9341,Hss6542,Hss M35 and ... .The Standard of Hss Drill Bits have Din1897,Din338,Din3402.The Degree of the Hss Drill Bits have 118 and 135.3.The finished of Hss Drill ... Bits have Black Finished,Bright Finished,Titanium.4.The ...