Features 1、Made of high quality hard alloy, high hardness, high strength, not easy to break. 2、With extremely powerful clamping force to ensure stability during using. 3、Can extend the distance between the edger and the drill bit of the engraving machine, making the engraving distance more suitable. 4、Extend the shank length of router bit and make your woodworking project more flexible. 5、1/4 shank, 8mm shank and 1/2 shank for your choice, easy to use. 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