Check the listing for details. Laser Diode Housing w/ 3 Element Lens - 9mm / TO-5 - 12mm x 30mm SOLID BACK Blue. Condition: New. Listed at 19.95 USD. Listing is for One SOLID CORE 12mm x 30mm Laser Diode Housing Features: 1. Suitable for wavelengths: 405nm - 465nm 2. Diode Size: TO-5 (9mm)3. Material: Aluminum/Brass/Chrome 4. Size: 12mm X 30mm（Outer diameter x length） 5. Diode Installation: Press In6. Lens Holder: M9x0.5mm7. Solid Aluminum Core Back Half for Increased Heat DissipationAlways wear protective safety glasses or goggles... You've only got one set of eyes!!!I normally ship the same day or before the next available pick-up. Once your order is placed it will go out right away because I don't want you to have to wait any longer than you have to. Most orders are delivered within 3 business days in the continental US. International orders take longer of course but they have been getting delivered fairly quickly. Please don't hesitate to contact me with ANY questions regarding my listing(s). I can offer a lot of technical assistance and/or point you in the right direction to find the answers you are looking for. I am usually very quick to respond and I'm more than happy to help. I will leave positive feedback once the transaction is complete. Please return the favor!Please check out my new EBAY STORE!!!