Black&White,Milled,high quality masonry drill Masonry Drill Bits, Milled, Square FlutesManufacturing Process: Milled Material: 40Cr Steel and YG8C Carbide Shank: Straight shank Surface: Black Oxide, Zine Plated, Black & Whiet, Nickce Plated, Chrome Plated. Standard: Q/321181 RFD004 OR DIN8059 Size(mm): 3*60mm - 25*600mm