drill bit used for drilling bottom hole drill, reamer to bottom hole expanded. It is in the casting, forging, stamping, prefabricated hole basis mouldings on the reaming, in order to achieve a high surface quality of small tolerances.

reaming bit specification (mm)	is equipped with a cutter rod (mm)	reaming bit specification (mm)	is equipped with a cutter rod (mm)
phi 38- Phi 43	with the diameter of 35	phi 44- Phi 48	with the diameter of 40
phi 49- Phi 60	with the diameter of 43	phi 61- Phi 72	with the diameter of 56
phi 73- Phi 77	with the diameter of 65	phi 78- Phi 87	with the diameter of 70
phi 88- Phi 107	with the diameter of 80	phi 108- Phi 137	with the diameter of 100
phi 138- Phi 177	with the diameter of 130	phi 178- Phi 250	with the diameter of 160
phi 251- Phi 500	with the diameter of 220	phi 501- Phi 800	with the diameter of 350