Are you serious about your craft? If so, then these file handles are for you! Our ferrules are solid brass threaded onto the wooden handle for a lifetime of work. For wood we use maple wood and Azorean wood. Both types are very strong and Azorean wood in particular. It comes from the islands in the middle of the Atlantic Ocean. It is very strong, forged into steel like strength by constant winds and changing weather. Also, both types of wood fantastic in reducing vibrations due to be the best wood used in vibrational dampening that will keep fatigue at bay. So, these are serious handle for people who are serious about their craftsmanship and tools they use in their projects. Whether it is for our Nicholson, PFERD or Swiss files you will be happy to have our handles on your files. We offer our handles in 2 sizes Small: holds Swiss files and files up to 6.35 mm or 0.200” shank diameter handle diameter 13 mm or 0.500 – 0.535 “ Medium: holds files up to max 7 mm or 0.275” shank diameter handle diameters for medium size: slim is under 16 mm or 0.625” balkier is 19 mm or 0.750” You can ship to us your files and we will make you custom order handles Do not hesitate to contact us if you need any additional info