1pcs 3-6mm 3-8 Extend CNC Motor Jaw Shaft Coupler 5mm to 8mm Rigid Coupling OD 4-5mm 4-6 4-8 5-5 5-6 5-7 5-8 6-6 6-7 6-8 7-8 8-8 health care meridian acupuncture pen magnet therapy instrument massage meridian energy pen massage 5 massage head energy pain
1pcs 3-6mm 3-8 Extend CNC Motor Jaw Shaft Coupler 5mm To 8mm Rigid Coupling OD 4-5mm 4-6 4-8 5-5 5-6 5-7 5-8 6-6 6-7 6-8 7-8 8-8 health care meridian acupuncture pen magnet therapy instrument massage meridian energy pen massager 5 massage head energy pain