Different sizes woodworking hole saw blades of different sizes to meet various hole opening needs.High quality using 50# carbon steel, a technology high frequency quenching, a woodworking circular knife, sharp and durable.Easy to use With the positioning drill, opening the hole is easy. It can be used with ordinary hand drills, impact drills, rechargeable drills, flat drills, etc.Convenient storage Comes with a plastic case to neatly store open hole knives , simple and effective.Wide use The hole saw is suitable for wood, plasterboard, plastic, PVC pipe, fiberglass and other items, which makes holes easier. Product description Made of carbon steel 50# carbon, the sawtooth of the woodworking circle cutter is sharp and durable. The saw blades are made of heat-treated carbon steel, ensure fast cutting, rust-proof, wear-resistant and long service life. This downlight hole saw kit can be used with a drill ordinary hand drill, impact drill, charging drill, flat drill, etc. Specification: Material: Carbon Steel p> Working depth: 25 mm Hole saw diameter: 5-piece set: 64mm, 76mm, 89mm, 102mm, 127mm 8-piece set: 19mm, 22mm, 28mm, 32mm, 38mm, 44mm, 54mm, 64mm 13-piece set: 19mm, 22mm, 25mm, 28mm, 32mm, 38mm, 44mm, 54mm, 64mm, 76mm, 89mm, 102mm, 127mm Notes: 1. These hole saws are NOT suitable for metal objects (such as steel bars), high density boards, aluminum boards, computer desks, etc. 2.The Material to be cut should be secured and at a right angle to the 90 degree hole opener. 3. During operation, if there is any abnormality or chip removal is not normal, please stop working and start again after cleaning. 4. The positioning drill and hole opener are easily stuck when drilling holes on thicker wooden boards (such as composite plates, compression plates, etc.), so please reduce the speed, otherwise the drill positioning will break. 5.Please allow 1-2mm error due to manual measurement and make sure you do not mind before ordering