The SC Stop Fitting is a premium full brass component created on a CNC Lathe. It has a 6mm hex key and diamond knurling. It is powder coated in black. The SC logo is laser etched onto the top exposing the brass underneath. Brass and powder coating instead of anodising is used for maximum corrosion resistance. They are threaded with the standard G1/4 BSPP thread and so are compatible with all PC liquid cooling components. The o-ring is G1/4 Buna50 Nitrile.Specifications:SC Brass Stop Fitting Black Powdercoat, 6mm Hex, Diamond Knurling, G1/4? BSPP Thread.O-ring G1/4 Buna50 Nitrile Rubber.