The Combination Tip Screwdriver set is designed for the fastening of combination head screws most commonly found on electrical devices and fittings. The set includes two 4-Inch (10 cm) Combination #1 and #2 sizes for the largest amount of applications. Both feature Klein's precision fit for added durability and long life. Made with quality steel for long-lasting bit shape and strength. Finally, a perfectly shaped Combo Tip Driver!