Product: 1 piece 10 mm shank CNC bottom-cleaning router bit — Two-screw thread lock cutter What this does and why you need it Precisely cleans and mills the bottom of grooves, slots and cavities on CNC routers and milling machines. Secure two-screw threaded lock keeps the cutter firmly in the collet, reducing slippage and vibration for consistent cuts. Compact 10 mm shank fits machines and collets that accept a 10 mm tool shank for straightforward installation and replacement. Key attributes Function: Bottom-cleaning router bit for CNC and routing operations. Package: 1 piece. Shank size: 10 mm. Locking: Two-screw threaded locking mechanism for secure mounting. Compatible materials: Plastics, aluminum, printed circuit boards (PCBs), wood, and other precision parts. Performance and practical benefits Reliable bottom-facing cutting action delivers flat, clean surfaces and accurate depths, reducing hand finishing. Threaded two-screw lock improves runout stability and reduces tool movement during high-speed machining. Versatile across multiple materials for shops that handle mixed jobs — from delicate PCB work to light metal and wood components. Typical applications PCB edge trimming and slot routing where precise, low-tolerance bottom surfaces are required. Small aluminum housings and plastic parts that need accurate bottom-face milling or slot cleaning. Woodworking tasks such as cleaning the bottom of grooves, dadoes or mortises on CNC router tables. Installation and use tips Ensure your collet and spindle accept a 10 mm shank and are tightened to the machine manufacturer’s recommended torque. Tighten both screws of the threaded lock evenly to secure the cutter and minimize runout. Use appropriate feed and speed settings for the material being cut to achieve the best surface finish and tool life. This 10 mm shank bottom router bit offers a simple, secure solution for precision bottom-facing cuts across plastics, aluminum, PCBs, wood and other small precision parts.