Feature:1. The hole saw kit is made of qualified M42 steel material with accurant electron beam welding and vacuum heating quenching function.2. Strong, firm and durable metal drill bit's quality is guaranteed, you can use it with confidence.3. Applicable to hole-opening in aluminum, steel, castings, wood, plastic, gypsum board and stainless steel.4. Comes with a suitcase for easy carrying and order storage as the great repair parts.5. Hole opener set is built to strict quality control standards, improved for more durability.Specification:Item Type: Hole saw bitDiameter Size: Approx. 16mm / (5/8-inch)Approx. 19mm / ( 3/4-inch)Approx. 22mm / (7/8-inch)Approx. 25mm / (1-inch)Approx. 32mm / (1-1/4-inch)Approx. 35mm / (1-3/8-inch)Approx. 38mm / (1-1/2-inch)Approx. 44mm / ( 1-3/4-inch)Approx. 51mm / (2-inch)Approx. 57mm /( 2-1/4-inch)Approx. 64mm / (1-1/2-inch)Approx. 68mm / ( 2-11/16-inch)Approx. 76mm / (3-inch)Hole Opening Depth: Plastic / Wood: 41MMStainless Steel: 3-5MMIron: 10MMColor: WhiteCase Size: Approx. 36 x 22 x 8cm / 14.2 x 8.7 x 3.1in.Package List:13 x Drill Bit1 x A2 Connection Rod1 x A4 Connection Rod1 x Extension Rod1 x Hex Screw1 x Hex Wrench1 x Metal SuitcaseNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.