Most Durable Hole Saw. Period;Customizable Hole Saw Case;Thermoset Coating reduces friction and drag, increasing overall speed and cordless efficiencies;Reinforced Grids on Top and Bottom Keep Hole Saws Securely Stored;Made in USA;New 3.5 TPI Tooth Design;All Access Slots enhance user productivity by providing best access and leverage to remove material slugs;Interchangeable Pegs Allow for Customizable Kit Configurations;Removable Accessory Box Offers Additional Customization Options