This read-create value is the Type of Service bits this ACL rule matches against in a packet's IP header, used together with aclRuleIpTosMask to define which TOS bits must match. An admin uses this alongside the associated mask to classify traffic based on a specific pattern of TOS bits rather than the full DSCP or Precedence value. For example, setting aclRuleIpTosBits together with a mask that isolates just the low-delay bit lets this rule specifically match traffic marked for low-delay handling.