The #2/4-5 4in1 replacement tips are used for the 5/16" hex with the ball and spring screwdrivers. Having a few extra tips can always come in handy! Eazypower is an industry leader for power tool accessories. Formed in 1985, Eazypower provides a huge array of accessories and replacement parts for your tools at a competitive price. Eazypower is consistently expanding and adding categories like Buffing & Polishing, Abrasives, Woodworking, Drill Bits, Sockets, and various adapters. Located in Chicago, Easypower operates out of a 108,000 square foot warehouse and manufacturing plant.