Guttering Top Rafter Bracket Galvanised, Fix To The Under Side Of The Open Rafters ( Spirit Level ) . Then feed The Bolt Through The Guttering Fascia Bracket And Through The Elongated Adjustment Hole & Secure With The Nut & Bolt . Repeat Until You Have The Whole Run And Set The Height Underneath The String Line That You Placed From High To Low One End To The Other.