What happened Kwikset, you changed the design? bigger cylinder screws with the same cylinder hole as old which is not the right size. The screw won't fit in the cylinder. The nice people at Lowes looked at it to and thought either the wrong screws or the wrong cylinder went into the package. I am not abandoning Kwitset but this was a surprise. Open the box before you purchase and look and see if the screws go through the cylinder before you buy.
If you ever need to change your Deadbolt & key the Kwikset components are almost universal. This means that one can usually change out the cylinder and use all the old hardware and latch, the part that moves in & out. The Kwikset brand is especially handy for landlords that need to change locks quickly & often. Another bonus Kwikset give you is the fact that repair parts are often in stock at your local hardware, and the keys somehow duplicate easily & correctly. I can't tell you how many times I've had a key made for a different brand and it didn't work. Kwikset duplicate keys always work the first time for some reason. A little security tip; if you use a foot or so long piece of plumbers strap (metal tape w/holes) screwed along the wooden door frame (behind the molding) to reinforce the hole for the latch - it makes it very difficult to kick in the door. If you need keyed alike locks, the key codes are on the package. So you can match up as many keyed alike locks as needed.