I have about 6 14 inch clearance between my bed frame and floor.  I wanted something to store shoes under the bed.  This is SUPER sturdy! I was not able to use this for my husband’s sneakers or his boots so I am using it for my flats and heels.  A lower profile wheel would make this purchase perfect and a 5 star.  Assembly was very easy, you literally just screw on the wheels.
*Update: I purchased appliance coaster wheels to replace the wheels that came with the product and gained enough clearance for my larger shoes to fit on the rack under our bed.