SIZE: Up-Cut Spiral CNC router bit with 1/2 inch shank and 1/2 inch cutting diameter, 1-1/2" cutting length, for CNC. Up-Spiral Bit: This CNC router bits great idea for mortise and tenons, grooving, slotting or routing deep blind holes, Up-cut bit leaves a smooth bottom edge. Widely Use: This spiral router bits suitable for CNC routers as well as any brand of routers with 1/4" collets. Material Application: Crafted from M2 High Speed Steel, this end mill offers exceptional toughness, durability, and machinability, delivering outstanding performance and great value for its price, Only used on softwood and hardwood. Our Service: :If you have any questions about the router bit 1/4 shank, please contact us and we will replace with new ones.