The Cal royal sl30-26d grade 2 pioneer passage function lever. The unique feature when installing this lock is the removable through bolts which allows you to install it in a standard 2 1/8 inch diameter hole without having to drill for the through bolts. This lock meets ado requirements and grade 2 specifications and is ulu listed. It is easy to install and can be keyed alike and master keyed. This is an entrance function lock, which means that it can be locked by thumb turn on the inside of the door once it is installed. Passage sets latch but do not lock.