Features Material: Milling Cutter Extension Rod is made of high quality carbide, high hardness, high strength, not easy to break, durable and practical. Make your work better, more efficient, and more durable processed products. Stability: It has a strong clamping force to ensure stability during use. Extend the shank length of router bits to make your woodworking projects more flexible. Durable: The distance between the edger and the engraving machine bit can be extended to make the engraving distance more suitable. Allows you to process products more efficiently, suitable for wood trimming, milling and engraving machines. Various options: 1/4 shank, 8mm shank and 1/2 shank for your choice, easy to use, insert the router bit shank into the extension collet and tighten firmly. Note: The less the clamped part of the shaft, the more force the bearing experiences, especially if the cutter head is large. So make sure you have to insert at least 3/4 of the handle. Specification: Item Type: Trimmer Extension Rod Material: Cemented Carbide Optional Milling Cutter Extension Rod: 1/4 Shank, 1/2 Shank, 8mm Shank Optional Weight: 1/4 Shank: Weight: 107 g / 3.8 oz(approx.) 8mm Shank: Weight: 84 g / 3 oz(approx.) 1/2 Shank: Weight: 131 g / 4.6 oz(approx.) Package List: 1 x Extension Rod Package List 1 x Extension Rod