午夜免费视频,久久精品av,午夜家庭影院,成人午夜,成人电影免费观看,国产精品视频,秋霞午夜,神马午夜影院,国产小精品,av国产精品,国产不卡一区二区三区在线,日韩欧美伦理一区,日本一区二区偷拍视频,久久精品久久久久久久,国产三级在线视频观看,日本最新一区在线观看,91精品福利在线观看,亚洲久久久xx,后入视频在线观看免费,日韩欧美久久一区二区三区,青青草视频网址在线观看,欧美日韩亚洲高清国产,欧美一区二区三区二,国产中文字幕在线观看不卡一区二区,日韩欧美中文字幕视频一区

Diamond drill,also called concrete drill is a new type of tool which can drill on RC,brick and stone,rock,china and fireproof materials.It is hold such characteristics as working without dust,high efficiency,smooth wall of hole and accurate size.It is available in many fields of construction,quality-checking,airfield runway,tunnel of road,railroad and railroad bridge.

   The diamond core drilling machine have functions of soft-starting, constant power, over-loading protection and stepless speed-regulation, second-step gear speed-regulation, third-step gear speed-regulation and with adjustable bracket,with vacuum sucker and drill an inclined bore at the angle of 0-90 degree.