BlockMaster Electronic’s Double Row Barrier Terminal Blocks are a valuable option for mounting on non-conductive surfaces.  Available from 10A-75A, 250V-600V.  9.5mm, 11mm, 14mm and 17.45mm.  Phillips/Slotted combo head screws, nickel plated. Value added services include adding 0.187″ or 0.250″ QCTerminals and jumpers.