Material: 45 steel, hardened by heat treatment, and then electroplated

Inner Diameter: 10mm
Cylindrical Diameter: 18mm
Overall Height: 13mm
Bottom Diameter: 32mm
Fixed Hole Screw: M4
Fixed Hole Distance: 26mm

Inner Diameter: 3mm
Cylindrical Diameter: 10mm
Overall Height: 12mm
Bottom Diameter: 22mm
Fixed Hole Screw: M3
Fixed Hole Distance:16mm

Inner Diameter: 4mm
Cylindrical Diameter: 10mm
Overall Height: 12mm
Bottom Diameter: 22mm
Fixed Hole Screw: M3
Fixed Hole Distance:16mm

Inner Diameter: 5mm
Cylindrical Diameter: 10mm
Overall Height: 12mm
Bottom Diameter: 22mm
Fixed Hole Screw: M3
Fixed Hole Distance:16mm

Inner Diameter: 6mm
Cylindrical Diameter: 10mm
Overall Height: 12mm
Bottom Diameter: 22mm
Fixed Hole Screw: M3
Fixed Hole Distance:16mm

Inner Diameter: 7mm
Cylindrical Diameter: 16mm
Overall Height: 13mm
Bottom Diameter: 32mm
Fixed Hole Screw: M4
Fixed Hole Distance: 26mm

Inner Diameter: 8mm
Cylindrical Diameter: 16mm
Overall Height: 13mm
Bottom Diameter: 32mm
Fixed Hole Screw: M4
Fixed Hole Distance: 26mm

Package Contents: 1pc x Coupler

Note:
Please allow a 1-3mm error due to manual measurement.
Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Thank you!