I have them and they are so easy to use and work much easier than stacking wood or plastic blocks. I ordered them after I had used the yellow "lego" blocks and they broke the first time. Here is a thread with more info about the Anderson blocks.
Anderson Thread Get them you will not be disappointed.
Regards,
David
Regards,
David
2014 Chevy Silverado 1500 6.2L CC with Max Towing package 4x4
2014 Grey Wolf 26DBH Limited