3M™ Roloc™ Shank is a mandrel or spindle, designed with a 1/4" or 6 mm diameter to fit 1/4" or 6 mm collet chucks or drill chucks. Our Roloc shank also has a 1/4-20 external thread to fit Roloc Disc Pads with 1/4-20 internal threads.Use 3M™ Roloc™ Shank to fit Roloc Disc Pads with 1/4-20 internal threads, via its 1/4-20 external threads. Our mandrel fea