... used in boreing reinforced concrete ground and wall,kinds of natural stone Diamond Drill Bits is used in boreing reinforced concrete ... ground and wall,kinds of natural stone,such as stone,ceramic,airway,bridge,granite,marble,etc ... .Segment Length: 14/24mm.Segment Width: 3/3.5/4mm.Segment Height: 7mm.Segment Number: 3/4/5/6/7.Specification as belows: Outer Diameer ...