What is it?

Well if you have been following Clickychick's journal you will know what it is by now.  I am way behind in blipping as I have been so busy.  This was the start of it.  

This was the day the Summerhouse (in kit form) was delivered along with a pallet of blocks to set it on.   As the garden does sometimes flood we are also using levellers to a) be absolutely sure things are level and b) keep the summerhouse a little higher off the ground.

This is a plan view of the leveller.