Michel,
Thank you for your interest in our product. The different color versions signify the age and modifications that we have made to the anchors over the years. The black model is the oldest and original version, and it was last in production 20+ years ago. The blue version is 17 - 20 years old, and the
current red version is 0 - 17 years old.
The newer versions have thicker stocks for added strength, the 32° & 45° angle adjustment, and the holes drilled out for the Mud Palms, which are shipped with each
anchor, and we recommend that you permanently install them.
Your question is not uncommon, as our anchors seem to be
sold quite frequently on eBay or Craig's List, and potential buyers often contact us to ask questions to make sure they are getting a new model version and at a fair
price.
For your awareness, our Lifetime
Parts Replacement Warranty applies to ALL Fortress
anchor model versions, no matter the age or how many times an anchor has been bought or
sold.
Please let me know if I can be of further assistance.
Be safe,
Brian
Fortress
Marine Anchors