Specifications:The extension rod made of high-quality materials, strong and durable.It can be used for automobile manufacturing, mold manufacturing, machinery manufacturing, etc.The extension rod is high hardness, strong and durable, angular clear and easy to loose.Item Name: Extension RodMaterial: High Speed SteelFeatures: Durable, Engraving Machine Accessory, Milling CutterModel:1 : Single 1/4" Handle Extension Rod ER16 (Not Included Collet)2 : Single 8mm Handle Extension Rod ER16 (Not Included Collet)3 : Single 1/2" Handle Extension Rod ER20 (Not Included Collet)4 : Single 1/4" Handle Extension Rod ER20 (Not Included Collet)5 : Single 8mm Handle Extension Rod ER20 (Not Included Collet)Product Size:1 , 2 : 88mm x 22mm x 22mm/3.46" x 0.87" x 0.87" (Approx.)3 , 4 , 5 : 88mm x 28mm x 28mm/3.46" x 1.10" x 1.10" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Extension Rod (Not Included Collet)