Fits:JCM 125 Q Magnetic Base Drill up to 1-1/4" (32 mm),JCM 200 Q-1 Magnetic Base Drills up to 2" (50 mm),JCM 200 U Magnetic Base Drills up to 2 in (50 mm),JCM 200 auto Fully Automatic Magnetic Base Drills up to 2" / 3-1/8" in (50/80 mm),JCM 256 U Magnetic Base Drills up to 2-9/16" (65 mm) 3-1/8" (80 mm),JCM 312 U Magnetic Base Drills up to 2 9/16 in (65 mm) 3 1/8 in (80 mm),JCM 312 auto Fully Automatic Magnetic Base Drills up to 2" / 3-1/8" in (50/80 mm)