Anyone how does the conic pyramid drill he is using in this image is called and what's its use ? (drilling probably but why the shape ?): https://images.square

Anyone how does the conic pyramid drill he is using in this image is called and what's its use ? (drilling probably but why the shape ?): https://images.squarespace-cdn.com/content/v1/67b67e84acd1811dcbf19219/fd67ebe6-6593-4681-81b3-892081b33ea4/20250211_BedsideLamp.00_05_34_17.Still008.jpg https://images.squarespace-cdn.com/content/v1/67b67e84acd181...