- This Set Includes: > 1 X THE SIZE THAT YOU BUYING Bi-Metal Hole Saws With in 40 mm Max Cutting Depth  > 1 X Mandrels,  > 2 X Drill Bits,  > 1 X Hex Key > 1 X Ejecting Spring  - Cuttex Tools Bi-Metal Hole Saw Made of High Speed Steel (HSS) Bi-Metal, The Cutting Edge is Made of High Hardness (75~81 HRC) + %8 Cobalt, That Makes Huge Different While Working with it and Very Long Lasting Life Of Hole Saw , High Strength Hard Steel, 2 mm Thick. Very Sharp Teeth - Suitable for Metal, Steel, HardWood, PVC Panel and ALL KIND OF WOOD, Excellent Set for Commercial, Professional and Home Use.  - Anti-Rust Oil on the Surface to Protect the Hole Saw From Natural Oxidation - CUTTEX TOOLS Hole Saw Set Comes With a Nice Hard Carry Case To Keep All Saw Blades and Accessories Organized and Convenient to Reuse. - Smooth finish; sharp teeth reduces resistance during cutting and allows fast and clean cuts  - If you have any question about our products, please feel free to contact us. We will always provide you with professional services until you are satisfied * DESIGN & QUALITY INSPECTED BY CUTTEX TOOLS - ORANGE COUNTY - CALIFORNIA