Name: Masonry Drill Bits, Rolled, Zine Plated Manufacturing Process: Roll Forged Material: 40Cr Steel and YG8C Carbide Shank: Straight shank Flute: Normal Type Surface: Black Oxide, Zine Plated, Black & Whiet, Nickce Plated, Chrome Plated. Standard: Q/321181 RFD004 OR DIN8059 Size(mm): 3*60mm - 25*600mm Item No.: TY-M001