Two types of dust bags are available, one is pre-opened with about 65mm holes, suitable for 50-63 drill bits. The other is to use the wallpaper knife to cut the positioning hole along the location according to the different drill bits. When cutting, it must be thoroughly cut to the end to prevent the dust bag from rotating with the drill due to broken lotus threads. There is no difference between the good and the bad. It is more convenient to use the open type for air conditioning installation. For other such as plumbing, you can choose the non-open type, which can be selected according to your own habits and feelings. When using, make sure that the wall is smooth, flat and clean, and the film is flat and pressed properly to enhance the sealing effect. When there is a lot of water in the reinforced concrete, you must open the bottom of the bag, insert a slightly harder sewage pipe and seal it with a waterproof tape, so that the sewage flows while playing, reducing the weight of the bag and reducing the risk of punching.
\ \
\ \