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Continuing the topic of processing hardened metals, I want to share my experience in drilling balls from a bearing. The story will be about how you can drill a ball from a bearing with improvised means, which can be purchased at any hardware store or on the market. As you know, hardened steel of the ShKh15 brand or its analogs is used in the balls from the bearings, so it will not be possible to drill it with a conventional drill for metal.