Jonas Roscinas released a new pack featuring 115 seamless pattern height maps that will help you add details to hard-surface models.
It is worth noting that the pack can be used for commercial projects. Jonas states that this pack was created for “people that want to take their creations to the next level and improve/enhance the final result.”
Alpha Maps are 2048×2048 and 16bit of depth.
And here is a little guide to using it:
You can learn more here.