CRAIN 1500 23 FOLDING TAIL BLOCK COMPLETEThis multi function three position tail block has a 20 inch flat position for stretching off straight walls. It folds square for stretching off outside corners found in "L" shaped living room dining rooms. You can stretch off round posts by putting the legs at a 135 angle. This also locks the pivot so you can stretch all the way around a post as can be helpful in basements. This tail block also has wheels to help move it down the wall fast, and solid