Construction Hardware And Accessories Leading Manufacturer of Casting Go – Go Nut, Jack Nut, Bottom Cup Sheet Metal, Top Cup Malleable Cast Iron, Ledger Blade M.S. Forged, Pressed Swivel Clamp. SERVICE DETAILS Casting GO – GO NUT Gogo Clamps are made out of C.I. Casting with MS Bolt to clamps. JACK NUT Jack nuts are malleable casted available in two types light & heavy duty. It is available as required galvanized or non galvanized.