Chuckaway removes the common problems associated with chuck headed core drills: Chucks seize up over time.Chucks require a chuck key which may get lost.HEX arbors are at risk of shearing off on the flats in chucks due to vibration and coming loose mid drilling.Chuckaway can also be used with the Chuckaway extension bar to penetrate deeper walls.No chuck or chuck key.Quick and safe.Maintenance free.Quick release clip system.High tensile steel built to last.Technical Specification:Product Type: Core Extension Kits