الوصف

we can manfactre Core bits with different size and different material,such as TC casting core bits and PDC core bits.we can manfactre Core bits with different size and different material,such as TC casting core bits and PDC core bits.
we can manfactre Core bits with different size and different material,such as TC casting core bits and PDC core bits.we can manfactre Core bits with different size and different material,such as TC casting core bits and PDC core bits.