1Made of Alloy Steel: The extension chuck is made of alloy steel, which is durable and has long service life. 2High Concentration Shank: The extension chuck has a high concentration shank, so there is no need to worry about shaking and bending. 3Complete Cutting Depth: The extended chuck can eliminate the danger of directly removing the shank, and the drill bit can be extended to provide a complete cutting depth. 4Convenient to Carry: The extension chuck is small in size, convenient to carry, easy to install, convenient and practical. 5Application: This is an extension chuck suitable for woodworking trimming, sanding and engraving machines. Item Type: RouterColletExtensionChuck Material: Alloy Steel Purpose: Extension Collet Shank Shape: Round 1 x Extension Collet 1 x Storage Box Make sure that the router chuck extension is assembled correctly. Please note that the extension handle should be tight, but the collet nut should be tightened only with the same pressure as any router collet.