8 INCH MASTER GRADE STAINLESS STEEL SPHERICAL CONCAVE CUTTER 205 MM (8INCH) STAINLESS STEEL SPERICAL CONCAVE CUTTER One of the most important bonsai tools in your tool bag is the concave cutter. Its primary function is to remove larger branches in such a way that you promote rapid healing. Used properly the spherical concave cutter will leave a tear drop shaped wound that leaves a smoother callous as it heals that will blend in well with the trunk and not produce an unsightly bump that distracts from the overall beauty of the tree. The 8 inch size is perfect for the small to medium size bonsai.For the larger trees use the 11 inch size. Exclusive to Bonsai Vision and aimed at the discerning bonsai enthusiast, we are pleased to offer these master grade stainless steel bonsai tools. These tools are hand crafted and finished to prefection. With precision polishing and finishing these tools are razor sharp and are cold forged from Japanese tool grade stainless steel. We have designed these tools with comfort and ease of use in mind. With close to 30 years of growing and working on bonsai I understand the importance of quality tools that will hold their edge and feel like an extension of your hand. We feel so confident in the quality of our tools that we offer a 30-day money back guarantee. If you are not completely satisfied with the tools you may return them for a complete refund. We also have a 2 year limited warranty against any manufacturing defect. Because we are a direct importer from the factory we can offer these tools at wholesale pricing, saving you up to 50% over comparable quality tools. The proper tool will help you in completing the vision that you have for your bonsai. .I have had the opportunity to employ the bonsai tools that you provided me for trial use. I find that they are superior to all other tools I have previously used. They have the combination of robust construction coupled with excellent fine blade-tip design. This allows a more flexible use of the tool. Flexibility saves time and in my capacity of Curator of Bonsai at the Clark Center for Japanese Art and Culture saving time translates into the ability to work more efficiently on the Clark Center Bonsai Collection.. Bob Hilvers When purchasing Bonsai Tools be aware of the great differences in the quality and functionality of the tools. If you plan on continuing with bonsai for years to come then you are better of spending a little more initially for your tools that will last a lifetime rather than purchasing a set of tools that will last no more than a year or two. Cheap tools are just that, they are not designed to last or perform the tasks of maintaining a bonsai that might last you for 30 or 40 years. You should purchase tools just once and with proper maintenance and care they will be something that will last your lifetime and beyond.