Miller Fusion Standing Seam Roof Anchor Post - up to 24 in.* The Miller Fusion Post can be used for permanent or temporary use on standing seam roof spacing up to 24 inches. If you forget it on the roof, no big deal, it can be used permanently. * The clamping bolts of the standing seam roof anchor post tighten from above the base plate for easy fastening and inspection. You won't have to contort your body to install this bad boy. * The quick set up design does not require roof penetration to sub surface