GBC Leather Look Premium Presentation Covers, Binding Covers, Non-Window, Rounded Corners, Black, 200 Pieces Per Box (2000712)

this video will show how to measure for a rounded corner radius dimension using a carpenter's square or t-square you snug it up to the corner making sure then that it's flat against both the sides and notice where the curve begins to break now we'll show that in a little more slow motion here with a still you can see that right around the v mark is where the curve begins to start right about five inches on the radius you always want to round down so less of the cover is cut off if you're not exact so probably for this cover either a four and a half or four inch radius would fit it perfectly if you prefer to choose and measure your old cover process is exactly the same now the t-square up to the old cover notice where the curve begins and again in this case it's going to be four or four and a half inches for the radius and that's what I would order for this cover