The Ruko countersink 102121T is a high-speed steel tool with a 20.5 mm diameter and a titanium nitride coating for enhanced durability. Manufactured by Ruko, this single piece countersink bit is ideal for preparing holes in metal and wood materials. It is commonly used in machining applications for creating conical holes or to deburr drilled holes. https://elecena.pl/product/28443586/ruko-102121t-countersink-20-5mm-hss-tin-for-burr-free-cutting 2025-04-16 https://elecena.pl/product/28443586/ruko-102121t-countersink-20-5mm-hss-tin-for-burr-free-cutting 2026-07-04