5pcs of Genuine Y4REK 

8mm (5/16") x 50mm strong screw holder for stainless steel Tek screws hex head bit nut driver

High quality nut-setter out of stainless steel for hexagon head screws. 

Stainless to prevent the risk of extraneous rust. 

Non-magnetic design with retaining spring. 

1/4" hexagon hex drive.