Product description：Jaw Spider Coupling1.StructureJaw / Spider2.MaterialAluminum3. TechnicsMachining,Website: , milling4. Length21mm5. Outer dia19mm6..Inner dia3-15mm(as your requirement)7.Tolerance+/- 0.02mm8. ApplicationShaft coupling, motor coupling9. OEM orderWelcome10. Custom designWelcomeA jaw coupling is a type of general purpose power transmission coupling that also can be used in motion control (servo) applications.