Leon,

I don't have a good picture of the wheels. Basically the bottom is a 2x4
frame, with a 3/4" plywood skin on top. 6 - 4" 100 lbs rated wheels are
attached to the bottom of the plywood. (one in each corner and 2 in the
middle of the long sides) Thus, 1/2" of wheel protrudes from the bottom of
the frame. The L block are about 5/8" thick on the bottom to lift the
wheels off the ground, making the bench fixed. Based on the article, the
finished bench is about 400 lbs. full. So, it does not move. Solid as a
rock. But, pull out the L blocks and roll it where ever.