IVY Classic 45488 9/16" x 2-9/16" Magnetic Nut Setter, Impact Plus, 10-Pack Chrome Vanadium Steel for extra strength and durability Designed to withstand the high torque (rotational force) of impact drivers, Impact Plus (Registered Trademark) Lobular design reduces the stripping of the corners of the nut, fasteners are driven on their flat sides instead of their corners Extra strength magnet secured in place with splined brass bushing results in greater retention of your fastener Size: 9/16-inch hex, Length: 2-9/16-inch, Shank: 1/4-inch hex power