1.Twist lock 2.Coaxality is 0.02MM 3.Microcomputer control 4.LED speed display screen 5.self diagnostic display JSDANingbo JSDA Electronic Industry Co.,Ltd commits to produce series of high precision micro grinder machines.Our products are broadly used in Nail art , Jewelry engraving , Dental grinding , Mould polishing , Wood carving , Craftwork fabrication and so on.1.With a history of over 8 ...