Details:

This is a high quality aluminum heatsink/heat sink holder for 12mm laser modules suan as 12mm red, green and IR laser modules. The heatsink holder can help to cool the laser to prolong the working time of laser mdoules. It is a laser module holder and mount to fix the module.
The Inner diameter of this one is 12.3mm, it has one bolt on the top to fix the laser.

Package:

1 x Aluminum Radiator Heatsink 20x27x50mm for 12mm Laser Module Golden-Color