Remark: When you order, pls remark : 1,diameter(19mm,22mm)
2.type(1no1nc,2no2nc)
1.M type anti slip design,with super self-locking performance comfortable operating feel; 2.With super metal texture and high-grade appearance design; 3.M2 mini head,small and exquisite; 4.Mechanical life:up to 10,000 cycles; 5.Optional 1NO1NC,2NO2NC function; 6.The internal use of high quality silver contact. 7.It has applied of many patents ,CCC,CE approved;