Disston QUICKCORE, 2 1/2" , 10X FASTER CORE EJECTION, Quick Change, 1 7/8" Depth of Cut, Part E0100214 DISSTON Blu-Mol Xtreme QuickCore Hole Saws. Patented hole saw system that has up to 10X faster core ejection. Eliminates the #1 Issue with using a hole saw of core ejection. Quick change sleeve with and open back arbor allows for fast core removal. One Mandrel for all sizes. The wide Diamond slot and open back design allow for increase visiablity and cooling while cutting. The QuickCore design allows for immediate plug removal with no need for added tools. 1 7/8" depth of cut and Bi-Metal construction allows for cutting into wood, metal, plastic, and stainless steel. All sizes of hole saws available. Works with Disston Hole Saw Arbor E0100233 Features QuickCore?s patented technology provide up to 10X FASTER CORE EJECTION through the unique open-ended design QuickCore?s patented mandrel enables the user to quickly change hole saw sizes One ?QuickCore mandrel for hole saw diameters " to 6" simple slide sleeve engagement. Wide diamond slots and open back arbors allows for increased visibility and cooling USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.