The No. 18402 is the replacement blade for the Z-Saw VIII 265 (No. 18401), the folding kataba that closes over its own teeth so it rides safely in a tool bag.
It's the same 265 mm (10.4 in) blade the saw comes with: 0.6 mm thick with a 0.92 mm kerf, and impulse-hardened universal teeth at 15 TPI for rip, crosscut and angled cuts in softwood, hardwood and sheet goods. When the teeth dull, fit a new blade and keep your handle.
Z-Saw's maker, Okada Hardware, has made saws in Miki, Japan since 1943 and was the first company in Japan to impulse-harden saw teeth.