1.High-speed carbon steel teeth are safe and durable, heat treated for fast, clean cuts.2.The ceiling light hole cutters are packed in a molded box.With this box, you can organize these cutting tools well and you can remove them easily and conveniently.3.Features: Material: carbon steel.Working depth: 25 mm.Hole saw diameter: 19mm, 22mm, 25mm, 28mm, 32mm, 38mm, 44mm, 54mm, 64mm, 76mm, 89mm, 102mm, 127mm.4.The material to be cut should be fixed and at a right angle to the 90 degree hole opener.△ If any abnormality occurs during operation or chip evacuation is not normal, stop work and work again after cleaning.5.Suitable for wood, Placoplâtre, plastic, PVC pipe, fiberglass, thin aluminum plates and non-ferrous metals. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.