Featuring heavy-duty 9-gauge thick steel construction, the Gobo Plate XL from Matthews is designed to prevent a 4.5" grip head from being dismounted when loosening it for adjustments. The plate has cutouts to accommodate two grip heads, a 5/8" hole for Baby pins or rods, and six evenly spaced markers on the edges for positioning at a 45-degree angle without measuring it out. Matthews provides multiple ways to mount the plate. There are four 1/2" diameter holes, twelve 3/8" bolt holes, and twenty screw or nail holes.