13 different hole saw blades: There are 13 hole saw blades for wood in different sizes (19/23/25/28/32/38/44/51/63/76/89/102/127mm) in every package, and these wood hole cutters can meet various needs in different situations. High quality and durability: Made of 50 carbon steel, the saw blade cuts from circle to wood is sharp and durable. Thanks to high-frequency quenching, these wood cutting tools have superior hardness (HRC4-48) and long service life. A good helper for woodworking: with the drill of positioning, this circular hole cutter kit can help you punch a hole easily. And this downlight hole saw kit can be used with ordinary hand drill, hammer drill, loading drill, flat drill, etc. Portable storage box: cutters of 17pcs ceiling light holes are packed in a blow box. With this box, you can organize these hole cutting tools well, and it's convenient and easy to take them out. Wide Usage: These tough hole saws are suitable for wood, plasterboard, plastic, PVC pipes, fiberglass, etc. Specification: Material: carbon steel Working depth: 25mm Hole saw diameter: 19mm, 23mm, 25mm, 28mm, 32mm, 38mm, 44mm, 51mm, 63mm, 76mm, 89mm, 102mm, 127mm Tips: - These hole saws are NOT suitable for metal objects (eg steel bars), high density board, aluminum board, computer desks, etc. - The material to be cut should be clamped at 90 degrees perpendicular to the opening of the hole. - During operation, in the event of abnormality or chip removal is not normal, stop working and start again after cleaning. - The positioning drill and the hole opener sticks easily when punching holes on thicker wooden boards (such as composite plates, compression plates, etc.). So please reduce the speed, otherwise the positioning drill may break. Package list 13 x hole saw 1 large chuck with universal arbor 1 x small chuck 1 x hex key 1 x installation plate 1 x storage box