21Pcs Magnetic Nut Driver Set For Impact Drill, Driver Bit Set 1/4", Metric REASONABLE SET: Revvstark 21PCS magnetic nut driver set contains 7PCS metric magnetic nut driver(6mm 8mm 10mm 11mm 12mm 13mm 14mm), 7PCS SAE magnetic nut driver(1/4" 5/16" 3/8" 11/32" 7/16" 1/2" 9/16"), 3PCS impact socket adapter(1/4" 3/8" 1/2"), 1PCS Magnetic Bit Holder, and 3PCS quick-release extension (60mm 100mm 150mm) HIGH QUALITY S2 STEEL: Made of high quality S2 steel, the magnetic nut driver set has extremely high hardness and abrasion resistance, longer service life, and the surface is electrophoresis treated to prevent oxidation and corrosion, ensuring that it still maintains excellent performance and durability over a long period of time SUPER STRONG MAGNETISM: Each nut driver set contains a high quality magnet, each nut driver has enough depth to ensure that the screws are firmly adsorbed to avoid falling and sliding, greatly improving the working efficiency and accuracy, suitable for a variety of complex working environments PORTABLE DESIGN, EASY TO CARRY: Equipped with storage bag, the compact design makes it easy to store in a toolbox or carry around. It is also an ideal gift for men, fathers, him or grandpa WIDELY USED: Suitable for household appliances, furniture assembly, electronics repair, automotive repair and many other occasions, it is a must-have tool set for families and professionals; Made to fit 1/4 in hex impact drivers drill screw bit set is not only work with impact driver, but also magnetic screwdriver bit perfect for any regular drill, electric and hand screwdrivers and more