Applicable for fast drilling of concrete, refractory bricks,asphalt and various stones. High efficiency and high quality. Huazuan drill bit for concrete,refractory bricks, asphalt Description:Used for wet cutting building materials such as concrete, bricks, granite, marble, stone,cements, etc.Specification: Diameter (D)Max Coring Depth(C)Overall Length(L)ConnectingMetric(mm)Inchesmmmm512”4505001- ...