Features: _x000D_ This drill bit has standard M22 thread which is suitable for most water drilling machines on the market. _x000D_ Made of 45# seamless steel tube, the tube body is not easy to deform during drilling. _x000D_ The cutting teeth of specially designed shape has great performance. _x000D_ The connector is in hexagonal shape, convenient to use. _x000D_ Widely used for drilling on reinforced concrete and other materials, such as air conditioning drilling, pipes, road signs, stair handrails, street lighting installation, heating transformation, bridges, airports, viaduct drainage holes. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Material: 45# seamless steel tube _x000D_ Length: 370mm/14.6inch _x000D_ Type(Optional) Bottom Outer Diameter Bottom Inner Diameter Top Outer Diameter Top Inner Diameter _x000D_ 30*370 30MM(1.18inch) 22MM(0.9inch) 30MM(1.18inch) 22MM(0.9inch) _x000D_ 32*370(G3/4 pipe) 32MM(1.3inch) 23MM(0.9inch) 30MM(1.18inch) 22MM(0.9inch) _x000D_ 36*370 36MM(1.4inch) 27.7MM(1inch) 32.86MM(1.3inch) 22(0.9inch) _x000D_ 38*370(big G3/4 pipe) 38MM(1.5inch) 30MM(1.2inch) 32MM(1.25inch) 22MM(0.9inch) _x000D_ 40*370(G1 pipe) 40MM(1.57inch) 22MM(0.9inch) 36MM (1.4inch) 23MM(0.9inch) _x000D_ _x000D_ _x000D_ _x000D_ Package list:_x000D_ 1 * Wet Drill Bit