While the service from Knobs and Hardware was great...the handle from Siro was very frustrating. I ordered 15 handles and 3 showed up without screws. The screws provided were the breakaway M4 machines screws. It took over an hour to adjust the thread to the proper length. The poor quality of the screw made cleaning up the threads difficult. I would recommend buying the correct length screw before trying to install these straight out of the box on the job site.