Description: Made of material, and practical to useSelf Locking Mini Drill Bit Brass Clamping Handle Connecting Rod M8 - 2mm/2.3mm/3.17mm/5mm[Product Usage]: it is used to connect a small motor with a core to make it a small electric drill. [Dimensions]: the diameter is about 10mm, and the total length is about 23.5mm; [Meaning of Parameter]: M8-2mm (representing 8mm thread, can use 4.8mm core, used for 2mm motor shaft)[Top size]: M3 screw, fixed steel shaft through side screw holeSpecification:Name: copper drill chuckColor: goldTotal length: 23.5mm Type: M8*0.75Diameter: 2.0/2.35/3.17//5.0MM (back hole)Product weight: About 8GPproduct includes:1*shaft1*small L2-shaped wrench*screwNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.