5 7/8" is the passing through diameter, 7 1/2" is the reaming diameter, 4 3/4" is the diameter of front bit.

We can produce both matrix body and steel body BI center bit, the cutters could be diameter 8mm, 13mm, 16mm, 19mm, blades quantity ranges from 3 to 8.

Order procedure :

1>Confirm 3D design.

2>Trial order.

3>Testing and improvment.

4>Mass production.

If the requirement is regular, we have mature design according to various of drilling conditions.

Source:- http://en.skbit.com/product/428.html

HeBei Solidkey Petroleum Machinery Co., Ltd.

Hebei Solidkey Petroleum Machinery Co., Ltd. locates in Hejian City, a historical city nearby Capital Beijing. Hejian city is one of locations of the well known Oilfield Huabei, rich resources and technical supports propelled the establishment and development of SOLIDKEY.

We specialize in researching and production of rock drilling bits, mainly includes tricone bits, PDC bits, HDD hole opener, foundation roller cutters and related tools, application fields includes oil well drilling, gas well drilling, geothermal well drilling, mining, geological survey, hydrographic survey, water well drilling, HDD pipelines projects, foundation projects.

With high-end equipment in the world, all of our activities are strictly complying with API specifications(Certificate No. Spec-7-1242) and ISO 9001:2015 standards. We have exported to more than 30 countries and areas with professional technical and marketing team, we devote ourselves to provide optimized solutions for various of applications and requirement, optimized solutions for specific projects is our working direction, we have same aim with customers--"Lower the cost of drilling per meter, achieve the most cost effective".