Easily installs in a Hougen Magnetic Drill* without removing drill arbor and coolant system. Adapter accepts a modified 118 twist drill with a 1/4" flatted shank that secures in adapter with a set screw. A convenient kit is available containing 02608 twist drill adapter with set screw, 02695 set screw, 1/2" twist drill, 7/16" twist drill, 3/8" twist drill, 5/16" twist drill and 1/4" twist drillConvenient kit for quickly drills small holes with a Hougen magnetic drillIncludes adapter and 5 Twist drill Bits. (1/4" to 1/2" dia)Fit 3/4" two flat magnetic drill arborsMade in USA