This Adjustable Hole Cutteris widely used for opening holes in wood, plastic board, gypsum board, PVC sheet, glass, porcelain, etc.from. This Adjustable Hole Cutter is suitable for any variable speed drill, it even comes with a round-tipped bit for lower RPM usage. Adjustable Hole Cutterhas 2 adjustable blades that can be adjusted for a range of hole diameter. Make sure the blades are equally adjusted before drilling or else the force will be uneven. Adjust to the required size, be sure to use the hex wrench to tighten the screws. Please don't use on steel sheet or other metal. The speed of drilling must be slow, and the material of drilling does not contain iron, nails or other metal. The Adjustable Circle Hole Cutter will make clean cuts from 30mm-120mm diameter. Colour:Black Material:Metal Package Contents: 1x Hole punching tools Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.