{"product_id":"5890-28-0-90","title":"Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 28mm Head Dia","description":"\u003cdiv\u003e\n\u003cp\u003e\nThe Robert Charles Single Flute Countersink 90° – M35 HSS-E 5% Cobalt – Metric is a precision countersink designed to cleanly countersink, chamfer, and deburr metric holes. It’s ideal for machinists, engineers, tradespeople, and hobbyists who need accurate, repeatable results with a clean finish.\n\u003c\/p\u003e \u003cp\u003e\nBuilt from premium M35 HSS-E with 5% cobalt, this countersink offers superior heat resistance, hardness, and extended tool life. It stands up to demanding materials like stainless steel, alloy steels, and non-ferrous metals, making it a reliable choice for everyday machining and production work. The 28 mm head diameter provides stability and consistent depth control for repeatable performance.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLonger tool life in tough materials\u003c\/b\u003e: The M35 HSS-E with 5% cobalt formulation delivers enhanced hardness and heat resistance, helping the countersink maintain sharpness and extend service intervals when working with stainless steel and other hard alloys.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFast, clean countersinking with a single flute\u003c\/b\u003e: The single-flute design minimizes chip buildup and chatter, delivering smoother entry and exit and a faster, more consistent finish on chamfers and deburrs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecise 90° geometry with stable 28 mm head\u003c\/b\u003e: Exact 90-degree countersink geometry combined with a robust 28 mm head diameter ensures repeatable depth and uniform chamfers across multiple holes.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis tool helps you achieve precise, professional results with less downtime and rework. Its durable construction and proven geometry support reliable performance across a wide range of materials, improving workflow, reducing setup time, and delivering consistent, quality finishes on every hole.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43418552303694,"sku":"5890-28.0-90","price":126.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/ZERO_FLUTE_DEBURRING_TOOLS_0b5381c3-8a47-43f3-b983-c181b4209f71.png?v=1770028985","url":"https:\/\/www.protool-ltd.co.uk\/products\/5890-28-0-90","provider":"Protool Precision Tools","version":"1.0","type":"link"}