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 Coupler

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