DISSTON Blu-Mol Xtreme QuickCore holesaw patented hole saw system with up to 10x faster core ejection. Eliminates the #1 problem with using a hole saw of the core ejection. Quick release sleeve with open back allows for quick core removal. One mandrel for all sizes. The wide diamond slit and open back design ensure increased visibility and cooling when cutting. The QuickCore design allows for immediate removal of plugs without the need for additional tools. 4.2 cm cutting depth and bi-metal construction allows cutting into wood, metal, plastic and stainless steel. All sizes of hole saw available.