The "Chuckaway" Chuck Replacement System is designed to fit onto the 1/2" 20 UNF thread of a Core Drill, roughly measures 13mm, once the chuck is removed. This can then be used in conjunction with the purposely designed Clipacore Core Adaptors, the Clipacore DUOCUT Adaptor (core in core system) and NEW "Chuckaway" Extension Bar.TGQC. The "Chuckaway" Chuck Replacement System prevents issues such as the chuck becoming loose when drilling, loss of the chuck key and the chuck becoming seized up over time. It also removes the need for using an arbor.