Brass T-Straps are used with our Brass Heavy Duty K Style Gutter Hangers and our 6" Copper Half Round Fascia Hanger when there is no fascia board to mount the gutter to. The T-Strap locks into the slots on our gutter hangers at one end to hold on to the gutter and the opposite end of the T Strap is then nailed into the roof deck to secure to the building.