Blulu 9/16"(14mm) Power Nut Driver, Nut Runner Hollow Socket with 1/4" Hex Shank, Fit Long Bolts and Ductwork Power Nut Driver for Overhead Fastening Applications Operations(1 Pack,6 Inch)

Overhead Fastening: hollow shaft nut driver for long bolts, studs or threaded rod, can reduce time spent hand threading fasteners over threaded rod, streamlines overhead fastening applications operations, Hollow Sockets: the hollow shafts allow long bolts and threaded rod to pass through in fastening applications, while the increased socket lengths provide better accessibility to nuts in hard to reach places located in high places in ceiling or ductwork, 1/4" Hex Shank: about 1/4" hex connect works directly with both impact drivers and drill drivers, automated fastening, attached fixed rubber ring, Hexagon Nut Socket Size: hexagon nut socket size has about 9/16"(14mm) (suitable for hex nuts of corresponding sizes), and about 6 inch, 8 inch, 10 inch (can accommodating bolts length) and other different lengths of hollow socket; Please determine the size you need before purchasing, Lenient Inner Wall: smooth, lenient hollow socket inner wall prevents shaft from biting and ruining threads for easy fastening and unfastening