A bit that can easily be used to make ragged processing. (3mm version) Can be hand processed. (Electric screwdriver recommended) The product has been baked into black color. We are not responsible for injuries or other reasons during processing. If the product does not arrive after 2 to 3 days after the scheduled date, we will contact you to confirm the product, so please contact us by message. Thank you for your understanding. If more than 2 weeks of shipment, the search will be difficult. We are not responsible for that case. Thank you for your understanding.