Features [SPECIFICATIONS] Use this router chuck extension to pass a router bit through the router table. Eliminates the dangerous temptation to pull the shank out of the collet to raise the bit and achieve full depth of cut. [WIDE APPLICATIONS] Easy to use, place the router bit extension into the router chuck, then place the router bit shank into the extension chuck and tighten. Let you process products more efficiently and durably, suitable for woodworking trimming, milling and engraving machines. [Material] Made of high quality hard alloy, durable and practical. Product Information Product Name: Milling cutter Product Material: Carbide Product size: reference picture Product color: black Packing list: milling cutter x 3 (one size one) Please note: 1. Due to the long shipping time, the item may be damaged during transportation, if the item is damaged, please leave us a message through the official website immediately before posting a comment, I will solve the problem for you. 2. Due to manual measurement, the size may have 1-3cm error. 3. 3. The color displayed by different monitors may vary.