Firstly I have a Hobart 210 mvp with .030 flux cored wire and they fit very well. The diffusers are better quality than the Hobart diffusers that are made for my car. The tips are well finished and ensure smooth wire feed and the nozzles are very well finished, fitting snugly into the diffusers and providing minimal build up when used properly in combination with jet submersible nozzles. I will order this product again and hope to try some of their products in the near future. I would recommend this product to anyone who wants a quality product.