The dies made from high-quality alloy steel in our company. The dies are chemically heat-treated for surface hardness. The dies And Slip Inserts are wear-reciting, corrosion-resistance. Customized products are available. Qualified API certified manufacture. Drilling dies are made of high-quality alloy steel and are chemically heat-treated for surface hardness. They feature wear-resisting, corrosion-resisting and have a long service life. We can also design and manufacture special inserts according to customers requirements