7 In 1 Nut Driver Set, Easy, 1 Handed Driving, Sizes Are Interchangeable, Color Coded Shaft Ends Make It Easy To Identify The Size, Strong, 1/4", 5/16", 11/32", 3/8" & 1/2" Rare Earth Magnets, 7/16" & 9/16" Spring Coils Holds Nuts & Bolts In Place Without The Use Of Magnets, 1/4", 5/16", 3/8", 7/16" & 9/16" Hollow Shafts For Driving Nuts Deep Onto Bolts Or Threaded Rod, Heavy Duty Handle & Shaft Exceed The Torque Performance Of Regular Nut Drivers, Wrench Assist On Handle For Added Torque On Tough Jobs.