This 1/2" Hollow Nut Driver by Jonard Tools offers a secure grip and quality design. The full-length hollow shaft works great when dealing with stacked circuit boards or long bolts/studs, while its internal shaft flanges prevent the handle from slipping. The ergonomically designed handle is complete with thermoplastic rubberized grip for comfort and torque. It meets ASME B107.110 and ANSI standards for maximum safety and durability.