{"product_id":"5890-16-0-90","title":"Robert Charles Single Flute Countersink 90° - M35-HSS-E 5% Cobalt - Metric - 16.0mm 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 bit engineered for accurate countersinking, chamfering, and deburring of metric holes. With a 16.0 mm head diameter, it provides robust material removal and consistent chamfer geometry to deliver reliable results.\n\u003c\/p\u003e \u003cp\u003e\nAimed at engineers, machinists, hobbyists, and maintenance professionals, this tool performs well on tougher materials thanks to its cobalt-enhanced M35 steel. The 5% cobalt content increases hardness and heat resistance, helping maintain a sharp edge for extended tool life when working with stainless steel, alloy steels, and non-ferrous metals, while still delivering a smooth, high-quality surface finish.\n\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eM35 HSS-E with 5% cobalt for heat resistance\u003c\/b\u003e: This cobalt-enriched steel holds a sharp edge longer and resists heat buildup, allowing longer cuts in stainless steels, alloys, and other demanding metals without frequent re-sharpening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e90° single-flute design for clean, precise chamfers\u003c\/b\u003e: The single-flute geometry provides smooth entry and consistent countersinks, reducing chatter and producing uniform deburrs for fast, repeatable results.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e16.0 mm head diameter for stability in metric work\u003c\/b\u003e: A larger, rigid head ensures controlled guidance and reliable contact on metric holes, helping you achieve accurate countersinks with fewer passes.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\nThis combination of durable materials, precise geometry, and metric-focused sizing helps you finish holes with confidence, improve workflow efficiency, and achieve dependable, repeatable results across a range of projects.\n\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43418552172622,"sku":"5890-16.0-90","price":41.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/ZERO_FLUTE_DEBURRING_TOOLS_5d66ada5-170c-415e-a1a6-e35e25a4782a.png?v=1770028970","url":"https:\/\/www.protool-ltd.co.uk\/products\/5890-16-0-90","provider":"Protool Precision Tools","version":"1.0","type":"link"}