Assuming you also had RewriteEngine On as the first line, the rest of this post is for further troubleshooting.
The second part of the line needs to be absolute, with the full domain included.
In other words, /items.php?section=$1&maker=$2 needs to have your domain added to the beginning with the
http://.
Also, I normally add the [L] flag to the end.
Code:
RewriteCond ${REQUEST_URI} ^/items/.*/.*/.*/.*.php
RewriteRule ^/items/(.*)/(.*)/(.*)/(.*).php http://www.mysite.com/items.php?section=$1&maker=$2 [L]
Also, the RewriteCond isn't needed in this case, as your rule only applies if the requested piece begins with items.
Brian.