enque/delay_max_refine is a SAP Parameter attribute which is used to control Maximum refine for Enqueue/wait operations information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If a lock operation fails, the system attempts to perform the operation
again after a specific period of time. This parameter defines how often
per second the repeated attempt should be made.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.