Unbrako 1116408 Alloy Steel Socket Cap Screw， Black Oxide Finish， Flanged Button Head， Hex Socket Drive， Right Hand Threads， 1/4"-20 Thread Size， 1/2" Length， Fully Threaded (Pack of 100)<img src="http://ecx.images-amazon.com/images/I/51ZgtXCKAeL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/413zpc7gkqL.jpg" noproxy>