Hanlinksy Permanent Ring Bit Systems are the concentric method of drilling through overburden with casing. They are assembled by pilot bit, casing shoe and symmetrical ring bit, and after drilling, the ring bit will be left in the hole. Such systems are suitable for all kinds of depth or size, and available for DTH drilling and Tophammer drilling, such as micropiling, anchoring, horizontal drilling, marine works, etc.
► Ingenious structure, high quality, high durability and easy operation.
► Drills straightly without deviation and cost effectiveness.
► Drills in any direction and fast through any ground.
► Pile bottom can be verified and applicable for man kinds of equipment.