6mm to 6mm Shank Router Bit Extension Rod Collet Engraving Machine Extension Milling Cutter for Wood Features:Made of high-quality carbon steel, sturdy and durabl-e for long life.8 various types to meet your different needs.Star-t slowly, wait for the balance to improve, you can slowly accelerate.High precisio-n woodworking milling cutter chuck can be perfectly combined with your engraving machine to clamp the engraving machine stably and improve work efficiency.Please ensure that the router collet extension be properly assenbled. Please make a note that extension shank should be secured tightly; while collet nut should be tightened only with the same pressure as any router collet.Specifications:Material: Carbon SteelType: 8 types(optional) 6mm shank to 6mm shank(A) 1/4" shank to 1/4" shank(B) 1/4" shank to 8mm shank(C) 8mm shank to 12mm shank(D) 8mm shank to 1/2" shank(E) 8mm shank to 8mm shank(F) 12mm shank to 12mm shank(G) 1/2" shank to 1/2" shank(H)Package Size: 100*30*30mm/3.94*1.18*1.18inPackage Weight: 110g/3.88oz(A, B, C); 135g/4.76oz(D, E, F); 145g/5.11oz(G, H)PackingList;1*Router Bit Collet Extension About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.