Nut and Bolt Hexagon M6 to M7 adapter

After building someones vise i found that holes are made for M7 bolts which i didn't find in my collection and in my local store so i decided to create this small adapter. This one is very tight to put on nut or bolt but with the help of lighter you can make it. So after i put this adapters on the nut i use my 3d pen to fix it more securely. I printed this adapters with PLA.