1" hole saw provides straighter more accurate hole than spade bitGuide jig ensures accurate hole placement for new holes & existing hole enlargementAll tools included in kit (power drill excluded)1-7/8" cutting depths on 2- 1/8" hole saw-ability to drill through standard exterior doors in one passProvides face to edge hole alignment, ensures proper function of lock or beveled edge doorsClamshellFor Bi-Metal Doors