Most Durable Hole Saw. Period;New 3.5 TPI Tooth Design;Customizable Hole Saw Case;All-Access Slots for Easy Plug Removal;Thermoset Coating for Faster Cutting;Interchangeable Pegs Allow for Customizeable Kit Configurations;Reinforced Grids on Top and Bottom Keep Hole Saws Securely Stored;Removable Accessory Box Offers Additional Customization Options;Made in USA