AutomationDirect’s line of RUKO countersink bits now include bits to accommodate UNC, or imperial (inch), fasteners. The round shank, 82-degree taper countersinks are CBN ground from fully hardened, high-speed steel blanks which creates a sharper and more durable cutting edge with precise tolerances.
Combined with axial relief grinding, this guarantees a smooth, low-heat, chatter-free cut up to 30% faster than competing countersink bits.
RUKO countersinks are suitable for standard industrial materials, such as steel, cast iron, stainless steel, non-ferrous metal, thermoplastics, and duroplastics.
Available in diameter sizes ranging from ¼-inch to 1-inch, and in individual pieces or a five-piece set, prices start at $10.00.
To learn more, click here. 
About AutomationDirect:
In business since 1994, AutomationDirect is a distributor offering thousands of industrial automation products for electrical control systems, including PLCs, operator interfaces, AC drives, motors, stepper systems, sensors, motor controls, enclosures and more. Their prices are typically well below the list price of more traditional automation companies because of their business model and focus on efficiency and the majority of their products are stocked for fast shipping. Plus, get free two-day delivery on orders over $49; some limitations apply. For more information, contact them at 800-633-0405 or visit www.automationdirect.com.
*Prices as of August 10, 2016. Check website for most current prices