{"product_id":"japanese-wood-chisel-set-yasuki-steel-a-4","title":"Japanese Wood Chisel Set Yasuki White Steel No.2 Triple-Hollow Back A-4","description":"\u003ch2\u003eSUMMARY\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMiki craftsmanship. White Steel sharpness. A back designed to guide the cut.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBring Japanese blade-making expertise to your workbench with the Koyama A-4 Nomikatsu chisel set. Made by Koyama Hardware Co., Ltd. in Miki, Japan, this oire chisel series combines White Steel No.2 (Shirogami No.2) cutting edges with a triple-hollow back design. For woodworkers who value a keen edge, straightforward sharpening, and the details of traditional Japanese chisel construction.\u003c\/p\u003e\n\u003ch2\u003eFEATURES\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhite Steel No.2 cutting edges:\u003c\/strong\u003e Yasuki White Steel No.2 (Shirogami No.2) is valued for its ease of sharpening and ability to take a keen edge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-hollow back design:\u003c\/strong\u003e Three hollow-ground recesses are separated by flat lands that help guide the chisel during cutting. The term describes the back design, not three layers of steel or a three-piece set. The hollow layout on individual narrow sizes should be confirmed before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eU-shaped steel reinforcement:\u003c\/strong\u003e The steel is formed into a U-shaped section (kasugai), increasing the blade's strength and toughness.\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0676\/8617\/0946\/files\/06.jpg?v=1794300529\" alt=\"\"\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlack back finish:\u003c\/strong\u003e The manufacturer describes the Nomikatsu triple-hollow model with a black back finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOire chisel format:\u003c\/strong\u003e A traditional Japanese woodworking chisel type for joinery and detailed fitting work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSET CONTENTS\u003c\/h2\u003e\n\u003cp\u003eThe A-4 series is offered in the following configurations. Each listed blade width is included once per set.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 pcs set:\u003c\/strong\u003e 9, 15, 24, 30, 36 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 pcs set:\u003c\/strong\u003e 3, 6, 9, 12, 15, 18, 24, 30, 36, 42 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSeries handle choices: Red oak, Silverberry (gumi), or Ebony.\u003c\/p\u003e\n\u003cp\u003eThe lead time will be confirmed after receiving your order.\u003c\/p\u003e\n\u003ch2\u003eABOUT KOYAMA\u003c\/h2\u003e\n\u003cp\u003eFounded in 1955 in Miki, Hyogo, Japan, Koyama Hardware Co., Ltd. manufactures chisels, hand planes, saws, and circular saw blades. The company combines traditional blade-making skills with precision forging, machining, and laser processing.\u003c\/p\u003e\n\u003cp\u003eIts chisels are produced in-house through forge welding, forging, heat treatment, grinding, sharpening, and handle fitting. This integrated approach brings Miki's blade-making tradition to the woodworking tools you use at the bench.\u003c\/p\u003e\n\u003ch3\u003eBlade-making process\u003c\/h3\u003e\n\u003cp\u003eKoyama's chisel-making process includes forge welding and hot forging of blade steels such as Yasuki steel and special high-speed steel, followed by spheroidizing annealing under a nitrogen purge. The blades are coated with tonoko powder and quenched in water, as in Japanese swordmaking. They are then tempered, ground, and sharpened.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/collections\/koyama-hardware\" style=\"color: #0000ee; font-weight: bold; text-decoration: underline;\"\u003eExplore the KOYAMA HARDWARE collection\u003c\/a\u003e\u003c\/p\u003e","brand":"KOYAMA HARDWARE","offers":[{"title":"5 pcs set \/ Red oak","offer_id":68100442325314,"sku":null,"price":57000.0,"currency_code":"JPY","in_stock":true},{"title":"5 pcs set \/ Silverberry","offer_id":68100442358082,"sku":null,"price":62000.0,"currency_code":"JPY","in_stock":true},{"title":"5 pcs set \/ Ebony","offer_id":68100442390850,"sku":null,"price":78000.0,"currency_code":"JPY","in_stock":true},{"title":"10 pcs set \/ Red oak","offer_id":68100442423618,"sku":null,"price":100000.0,"currency_code":"JPY","in_stock":true},{"title":"10 pcs set \/ Silverberry","offer_id":68100442456386,"sku":null,"price":110000.0,"currency_code":"JPY","in_stock":true},{"title":"10 pcs set \/ Ebony","offer_id":68100442489154,"sku":null,"price":140000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0676\/8617\/0946\/files\/a4_koyama.webp?v=1794299569","url":"https:\/\/salamander-tools.jp\/products\/japanese-wood-chisel-set-yasuki-steel-a-4","provider":"Salamander Tools","version":"1.0","type":"link"}