DESCRIPTION:

Shaft Diameter: 3mm, 4mm, 5mm;6mm, 7mm, 8mm

Shape: Hexagon

Material: Brass

Total Length:18mm 

Hexagonal edge to edge distance: 12mm(see picture) 

Screw hole diameter: 4mm 

Package Include: 

Coupling x 1

Screw x 2 

Wrench x 1