ZHENGZUAN is a Chinese manufacturer of a wide range of cutting tools required for automotive machining lines, including cylinder blocks, cylinder heads, gearbox housings, clutch housings, connecting rods, crankshafts, and more.

Their product portfolio includes special boring tools for machining valve seats and guides, as well as crankshaft and camshaft bearing bores (Cam Bore & Crank Bore), manufactured from PCD (polycrystalline diamond) and equipped with replaceable inserts.