ProFit QLH2MPCT 11/32-Inch Hex Bar with Integrated CT Center Drill Short for MP Hole Saws, 1 1/4-Inch - 8 9/32-Inch, Silver Integrated CT center drill Quick Lock System - allows you to change between hole saw sizes and styles in seconds Ability to Enlarge and existing hole and drill at an extreme angle with ProFit's Quick Lock Arbor