Good quality, and longer lifetime, competitive price Various diameter is avaible, such as 50mm, 56mm, 73mm, 89 mm. It is a kind of of non-core PDC drill bit, through our fine processing technology and quality control system, it performs very good in the mining feild. Meanwhile, its competive price makes it also popular in international market.CODEDia. mmdrill rod dia. mmhardnessweight kg1422-01- ...