Bought this rather expensive lock on a Saturday, and the box didn't include the latch I needed to complete the installation. Since my new door latch area wasn't chiseled out, I needed the optional "B" 'drive in' latch, "not included". You only find this out after you've opened the box! Being Saturday, I have to wait until Monday to contact Kwikset to get one. Not cheap I'm sure!!! Then the wait to have it arrive!!! Why not have the drive on ring option like they do the regular door latch???