Bi-Metal Hole Saw Kit, 16-Piece 3/4 Inch To 3 Inch Heavy Duty Steel Corn Hole Drilling Cutter Set with Drill Bit Adapter & Extension for Cutting Wood, Plastic, Aluminum, Metal Stainless Steel（SILIVN）

Use the correct arbor for the size saw to the used.Use pin-type arbor for Hoe Saws larger than Ø32.When mounting, lift up the disc with the pins and then screw the arbor down into the hole saw as far as it will go.Fit the drive pins into the pin holes in the hole saw by turning the hole save backwards.Push the pins in.Check that they are securely locked.Check regularly to make sure the drive pins are in the right position.Check that the arbor shank is securely inserted in the chuck on the drive unit.Tighten with chuck key.Cutting oil should be used when sawing steel.Do not use cutting oil when sawing cast iron.The cutting pressure should, however, be high so that each tooth cuts deep.Paraffin can be used when sawing aluminum.Use the correct rotation speed!Too high or too low a speed will decrease the life of the cutting edge.If the hole saw vibrates during sawing, the teeth may become damaged and break.The result is often a rough, imperfect hole.Apply the hole saw perpendicular to the work piece.If the hole saw is titled, this will cause uneven loading and abnormal wear on both the saw teeth and the grilling machine.Moreover, the dimensional accuracy of the hole saw can be affected.Clear away chips and plugs frequently in order to prevent overheating.The center bit is harder and easier to drill, but the stronger the hardness, the easier it is to collapse.Keep the drill bit vertical, the correct method of operation to maintain longer life and better work efficiencyCut perfect circles with these tools. Suitable for plasterboard, plastic, wood, MDF, aluminum, computer tables etc.This Hole Saw Kit features hole saws with enhanced tooth geometry to cut faster than previous hole saws.· Long lasting, fast cutting blade.These hole saws feature thicker walls to minimize tooth loss and improve durability.Hole Saws have wide slots placed low on each hole saw and multiple leverage points to make it easy to work plugs out with a screwdriver.This design effectively removes sawdust and chips and helps prevent plugs from becoming stuck in each saw.Hole saw set comes with the arbors.High rotational precisionSturdy body construction