Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Johnson Level & Tool J4900 98-Inch Aluminum Cutting Guide

Not able to use it! When it arrived the 'C' clamps and screws for the extension were missing. It states right on the packaging that it includes 2 'C' clamps and 4 screws. I contacted the supplier and they said they would ship the missing items but I still haven't received anything. You can't use it without 'C' clamps. I purchased on 9-16-07 and it's now 10-19-07 and still no clamps or screws. I'm very disappointed with the customer service!