... , length: 16"-18", adaptor: 1/4" UNC Wet cutting Diamond core drill 1.Wet cut drilling reinforced commcrete,block,glass,ceramics ... in all kinds of piping work for water,electricity,gas,air-conditioner,drainage,etc Features:Segments of 2-14" bits provide ... to hard aggregates, green concrete, asphalt and abrasive materials.Machinery:Core drill machine and hand drill, driven by hydraulic power station ...