Charsets Order and rockyou Mask files

[runga]

I am using Charsets to crack a hash but I see the order is random is there a way to force hash cat to use a specific order my command below

./hashcat-6.0.0/hashcat.bin -a 3 -m 7100 --username hash/osx.hash ?d?d?d?d?d?l


Also I don't understand the rock you mask files, what does 1-60 or 2-1800 mean in the title of the mask files of hash cat 6.0 ?

thanks