The DEWALT DWAFV07SET FLEXVOLT 7 pc Carbide Wood Drilling Hole Saw Kit is engineered to maximize runtime. The hole saws feature a self-feed pilot bit for fast, efficient cutting. It offers carbide teeth for long life, and a thin kerf design for high efficiency. It also has self-feed pilot bits for fast, efficient cutting, along with spring-loaded collar that automatically engages drive pins to prevent hole saws from locking to the mandrel. For use in cordless and corded tools. DEWALT FLEXVOLT high efficiency accessories are engineered to maximize runtime. Includes (3) Hole saws: 2-1/8", 2-9/16", 3-5/8", (1) Quick Change Mandrel, (3) Self-Feed Pilot Bits.