Get to Those Deeply Recessed Nuts and Bolts With Klein'S Hollow Shaft Nut Driver. The 6-Inch (152 MM) Full Hollow Shaft Fits Over Long Bolts and Studs For Most Applications Including Stacked Circuit Boards. The Exclusive Full Hollow Shaft Design With Rare Earth 1/4-Inch (6 MM) Magnetic Tip Features Unobstructed Pass Through, Even On Long Bolts.