Hex Socket Cap Screw: 7/8-9 Thread, 4-1/2,1/4''-20 x 1/2'' Lock-Out® Maximum Security Cap Screws, Flat Head, High Torque Oval Center with Pin, P27 Drive, 18-8 Stainless Steel,1/4,CSH-ST-UNF1/4-7/8 | Hex Socket Head Cap Screws - UNF Thread, CSH, Inch | Sunco | MISUMI,1