If you are looking for a premium wood carving tool that will help you achieve intricate and detailed woodblock (Mogu Hanga) and general wood carving designs, then do not hesitate to buy this Michihamono 6mm U Gouge Japanese Premium Carving Tool.This tool features an exceptionally long blade that can be extended further up the handle after being ground down by multiple sharpenings, meaning that it is expected to last longer when compared to other similar tools. While you can rely on U gouge wood carving tools for general carvings, making flutes or channels, finishings and removing large amounts of wood, expect this one to take it a step further and help with achieving more detailed designs. Excellent value for money.In adjusting the blade: gently remove the bolster from the handle using pliers and use the hinge pin to pivot the handle's top half until you expose the blade and shank. Proceed to detach the blade and shank from the handle by pulling it directly upwards. You can then return the blade back to the handle after sharpening it with a whetstone by placing the hook in its original hole that it was unseated from or move it to a higher position in the handle in the case of a depleted blade due to multiple groundings. To prevent this tool from weakening, ensure that your blade increments are done one centimetre apart. This helps reduce the total number of anchor points in the wood being made. The handle keeps the blade compressed in place by providing the required friction. It is therefore advisable that you keep off any adhesives or lubricant as these might affect the tool's functioning. Ensure that you do not exert excessive backwards pressure on the blade, as this prevents the hook from becoming deformed. However, in the case that your hook is deformed and there lacks any other way to hold the blade in place, it is advisable that you contact the manufacturer, who will issue you with a replacement. Expect this tool to last and post excellent performance even after the blade being worn down more than twice from the end of the bolster since purchase when used properly and with great care. .Approximate dimensions for this wood carving tool include:• Handle length (not including bolster): 9cm• Handle width (widest point): 1.5cm• Handle width (narrowest point): 1.0cm• Bolster length: 1.8cmThe background grid in the picture is in square millimetres.