Forney 72386 Mandrel Kit for High Speed Cutting Wheels, Includes both 1/4-Inch and 3/8-Inch Arbors This are easy to use This are highly durable This is manufactured in China Mandrel set for cutting wheels with 1/4-Inch and 3/8-Inch arbors 1/4-Inch shank for use on electric drill Used with abrasives