Description: 100% brand new and high quality. Aluminum Heatsink comptiable with CM4 Dedicated Aluminum Heatsink, Corrosion / Oxidation Resisting, Better Heat Dissipation Tailored comptiable with CM4 & Based Board Matching With The CM4 On Size And Mounting Holes, Fast Heat Dissipation Notched comptiable with Antenna Section No Hindrance To The Antenna Using With Base Board Comparing CM4 Cooling Solutions How To Install: 1. Attach thermal tapes onto the CM4, fix the nuts and standoffs to the heatsink 2. Fix the screws Note:Please allow 0-3mm error due to manual measurement. please make sure you do not mind becomptiable withe you bid. Package includes:1pc Aluminum Heatsink About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks comptiable with your cooperation and we'll make you feel satisfied.