Thick old lathe and plastered walls and just replastered. Pilot holes, pilot holes. Rescuer. Simply beautiful and stable. Slowly smooth. No pressure. No pulling or pulling. Worked like a charm and helped install new anchors. The result is nice round and narrow holes. Not found in most kits so I picked up a few and am glad I did. Works great as a pilot for a regular old Dewalt Jane 3/16" cordless drill.