Integral drill steels
Integral drill steels have three main types: 19mm word bit whole drill, drill, 22mm quarry whole word bit whole drill

H19/H22

Tapered tools
Sanshan taper drill to drill rod taper has three major types: 7 º taper drill can be used with a word, tooth, cross bits; 11 º taper drill can be used with column teeth, cross bits; 12 º taper drill can be used with column teeth, cross bit

7º /11º/ 12º

Shoulder drive drilling
Shoulder drive drilling is a hollow drill rod with six edges, all steel cross cross threaded, cross chisel bit and button bits

Shoulder drive drilling