TRYLON's non-penetrating heavy-duty roof mount with 3 1/2 in x 7 ft pipe mount. These non-penetrating heavy-duty roof mounts are truly universal since they can be used as a single-roof mount, or be extended to a versatile multi-panel sector frame mount. Each roof mount kit comes complete with a 7 ft x 7 ft ballast tray that allow standard off-the-shelf 2 ft x 2 ft patio stones to be used as counterweight.