Bed Making & Sofa Making Handy Tool - Big Size (38*12*7 CM)Making the Bed Was Always a Back Problem. Here's the Fix. The wedge mattress lifter that slides under any corner, raises your mattress 4 5 inches, and holds it there while you tuck, fix, and arrange with both hands free and your back completely out of it. The chore you dreaded just got 10x easier. Wedge Design: Slide In, Lift Up, Done. The inclined wedge shape does exactly one thing perfectly slides under the mattress corner and raises it 4 to 5