Applications: â?¦ PDC drill bit is mainly used to drill Oil well, gas well, water well, etc. â?¦ We design and produce specifie PDC bit with good performance for each soft, medium and hard formation. â?¦ Clay stone/lignite/siltstone/sands: We design 3-5 blades with low density cutter placement,large slot. Low cost,high speed . â?¦ Mudstone: We have experience to design suitalbe blades shape and cutter direction to get high drill speed and stalbe drill. â?¦ Gravel/limestone/shale/clay stone/tuff: Round crown and reasonable cutter direction. Drill smoothly in good speed.