Description:  16-76x370mm Diamond Core Drill Bit for Concrete Stone Tap Water Heater Air Conditioning Toilet Pipe Hole Puncher.     Specifications:  Product Name:Diamond cobalt-containing sharp water drill bit;  Material:Diamond;  Diameter:16mm/30mm/56mm/63mm/76mm;  Length:370;  Color:Red;  Quantity:1 Pc × Diamond Core Drill Bit;     Features:  - Standard hexagonal joint design: suitable for most drilling rigs in the market and a wider range of applications.  - Standard round joint design: high-quality screw hole interface is more convenient for loading and unloading drills.  - Precision steel pipe matrix: the matrix has high hardness and is not easy to deform and has high wear resistance.  - Sharp edge: thick diamond is wear-resistant and sharp and not easy to be damaged, and the sharpness is lighter.     Product Usage:  1. Drilling or coring of reinforced concrete and brick walls.  2. Air conditioning installation, pipes, road signs drilling.  3. Freeway and outdoor engineering drilling and core.  Precautions:  1. For rhinestones, water must be added during use. Fixed or hand-held drilling rigs are recommended.  2. To install the drill bit, first check whether the main shaft is swinging, whether the electrical and mechanical parts are normal, and ensure that the main shaft of the drill is tightened and kept concentric when the drill bit is installed.  Package Included:  1 Pc ×  Diamond Core Drill Bit