Description: Black Heat Sink Holder Mount for 12mm laser modules Specifications: Material: Aluminum Color: Black Inner diameter: 12mm Bottom length: 3.5cm， width: 3cm Top length: 3.5cm， width: 1.8cm Bottom hole diameter: 3.5mm， Top diameter: 2.5mm Features: Heat dissipation effect are good， easy to install， can be arbitrarily fixed in any place. Test laser is more convenient， will not roll. Package included: 1x Black Heat Sink Holder\/Mount