https://www.youtube.com/watch?v=d2iBcTK8CEA&t=1s
https://www.youtube.com/watch?v=d2iBcTK8CEA&t=1s
Monday, 9 April 2018
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Drill:- Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The drill bi...