Saw and mandrel made of carbon steel, Standard measures for the installation of knob locks of any brand, Ideal for installing locks and holes in wooden doors, MDF, chipboard, laminates, Plastic & Aluminum, Kit includes - 4 x Hole Saws: 1 1/4", 1 1/2" , 2 " and 2 1/8", 1 hexagonal chuck for greater grip security. Maximum Speed: 2,500rpm