Do you mean 6 mm? A little longer than a grain of rice? I had a gash about the size of 2 grains of rice end to end. I used a Park Boot for the inside, some super glue to fuse the gash, and some rubber cement for filler. Because what usually happens, with big gashes, you boot it, and you can see it just start to tear at the edges and get worse. I like to keep the tear from getting longer, and blowing out. That was a Continental 2000 or something all rubber. I just wouldn't go across the country on a boot, just not trustworthy.