How to use the EGM3.0 button bit grinder, bit sharpening machineFor more information, pls contact meXiamen Bestlink Factory Co., Ltd.Add: Unit 8001,No.350,Changle road,Huli,Xiamen China.361006Tel: +86-592-5601702Cell/Whatsapp/viber/wechat:+86-13600966313 (Mr.Richard Chen)E-mail:info@quarryingtool