This listing is for one X3 Beam Expander w/ M9 x 0.5 Lens Adapter.
 
The X3 beam expander is excellent for handheld lasers. It reduces beam divergence by three times and dramatically extends the visibility range of the laser beam. Constructed with a stable, stainless-steel housing, the beam expander has an adjustable focus allowing you to have full control to the beam!
 
The X3 beam expander is compatible with standard M9 x 0.5 lenses using the included adapter.

Technical specs
Housing 
Stainless Steel
Actual Expand Ratio
 3.3
Adapter thread
M11.4x0.5mm
Adapter parameters
3mm x 11.5mm
Aperture diamters
29.2mm