>>1663473https://www.rapidled.com/cree-cxb3590-4000k-70-cri/The holders allow you afix the cob and make the electrical connections to it without soldering directly to it
I mentioned making the effort about drilling as these holders are probably not going to fit the pre drilled holes on the heatsink in the guide picture but if you are already drilling for the protection device than making holes for the holder probably isn't a big deal
