About this 3D model

I have designed the first straight one-way manual hand drill in the world several days ago. It is powerful and handy. After I have used it especially from the fan’s comments, I realized that I can upgrade it a little for better usage.No. 1 Handle partI change the handle part to a screw fixed part. It is easier and convenient to useNo. 2 Add different drill size optionI add the different size of drill which covered the 0.8 to 4.0 mm.No. 3 Modified a little at the stall coupling partEnlarge the space between the small cylinder space. Now it is easier to couple them together between the cage and nuts. Detail information on Youtube：https://youtu.be/1lOdbRMHBew https://youtu.be/1lOdbRMHBew