["brand new and high quality\r\nFeatures:\r\nHigh precision screw thread and tapered hole.\r\nStrong impact resistance.\r\nfor impact dril and different power electric drill.\r\n\r\nSpecifications:\r\nColor: As Picture\r\nMaterial: High-Carbon Steel\r\nOuter Diameter: 21.5mm\r\nTaper: 2 Degrees 49 Minutes 24.7 Seconds\r\nWork With 0.3mm-4mm( 0.01\" - 0.16\") Drill,\r\nThe Maximum Clamping: 4.2mm.\r\nConnection Size: JT0 (Inner Hole Diameter Is 6mm)\r\nJT0 Taper The Biggest End Of Diameter: 6.350mm\r\nJT0 Taper The Smallest End Of Diameter: 5.800mm\r\n3.17mm Brass Mini Electric Motor Shaft Clamp Drill Chuck For 0.3mm-4mm Drill.\r\nDrill Clamp JT0 Connection Rod Connect Motor Drill For 3.17mm Motor Shaft.\r\n3.17mm Shaft Coupling Motor Connector BRASS.\r\nClose-Fitting With 3.17mm Motor Shaft\r\nCopper Rod\r\nFor 0.3~4mm JT0 Dirll Clamp\r\nMaterial: Brass\r\nMatch The Motor Shaft Diameter: 3.17mm.\r\nQuantity: 1 Set\r\n\r\nNote:\r\nNo retail package.\r\nTransition: 1cm=10mm=0.39inch\r\nPlease allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.\r\nDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes:\r\n1pc x Drill Chuck\r\n1pc x spanner / key\r\n1pc x 3.17mm Shaft Connecting Rod"]