3pc 1/4" Shank SAE Magnetic Nut Driver Setter QUICK CHANGE 1/4" 5/16" 3/8" These super-strong magnetized nutsetters keep a firm grip on fasteners while freeing up your hands! Magnetic shafts hold fasteners securely and a lobular drive prevents rounding by putting torque on the sides, not the corners. This set of nutsetters can be a life-saver in several applications, especially when working in tight spaces. Magnetic shafts hold fasteners securely to free up your hands in tight spaces Quick release 1/4 in. hex shanks Lobular drive prevents rounding by putting torque on the sides, not the corners Sizes: 1/4 in., 3/8 in., 5/16 in.