... and hole cleaning ability. Our button bits made with high quality of raw material through special heat treatment ... of bits from 30mm to 42mm with 4,6,7,11,12 degree, number of buttons is 4, 5 ... bits, blade bits including cross bit, and chisel bit with taper degree.(1) Type: button bits (2) Size: 19mm, ... 22mm, 25mm(3) Diameter: 30-42mm.(4) Taper: degree 4°46′ 6°, 7°, 11°, 12°.(5) Package: in ...