{"product_id":"5770-3-8-close-fit","title":"Robert Charles Plain Shank Counterbore M35-HSS-E 5% Cobalt - 3\/8 Cap Screw Size - 0.375 Pilot Size","description":"\u003cdiv\u003e\n\u003cp\u003eEngineered for precise counterboring, the Robert Charles Plain Shank Counterbore delivers durable, consistent performance for metalworking projects. It’s designed for professionals in precision engineering, automotive work, and general workshops who demand reliable, clean counterbores.\u003c\/p\u003e \u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eMaterial\u003c\/b\u003e: M35 HSS-E with 5% cobalt for exceptional heat resistance, wear life, and cutting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShank Design\u003c\/b\u003e: Plain shank for easy fitment in standard tool holders and stable, repeatable machining.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCap Screw Size\u003c\/b\u003e: Compatibility with 3\/8\" cap screws to ensure proper counterbore sizing for common fasteners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePilot Size\u003c\/b\u003e: 0.375\" (3\/8\") pilot to establish correct depth and alignment for accurate seating.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eThis counterbore enables precise, flush seating of fasteners with a clean, square bottom. The cobalt-enhanced HSS-E construction resists heat and wear during high-speed machining, extending tool life and maintaining edge fidelity. The plain shank design minimizes runout in standard holders, delivering stable cuts and consistent hole depths across a range of materials. Ideal for projects where accuracy and repeatability matter—from fine automotive machining to general workshop counterboring tasks.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Robert Charles","offers":[{"title":"Default Title","offer_id":43411728203854,"sku":"5770-3\/8-CLOSE FIT","price":63.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0560\/3747\/4382\/files\/Robert_Charles_Counterbores_ad43176d-ca55-4f68-8ef3-dcab10fced3f.png?v=1769685330","url":"https:\/\/www.protool-ltd.co.uk\/products\/5770-3-8-close-fit","provider":"Protool Precision Tools","version":"1.0","type":"link"}