The Replacement Blades and Bit for the Adjustable Hole Saw (Cat. No. 53710) come with all the necessary components, including 2 Blades, 1 pilot bit, 2 hex keys, 4 washers, 2 end screws, and 1 set screw. These replacements allow for smooth cuts ranging from 2 to 7-Inch (5.1 to 17.8 cm) in drywall and ceiling tile. The integrated gearing mechanism of the Adjustable Hole Saw ensures easy adjustment in 1/4-Inch (0.6 cm) increments and keeps the pilot bit consistently centered for precise cutting. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.