Great for orthopedic use - see UPDATE [SEP] These work very well for my application. My orthopedic surgeon recommended I buy shoes with heels to counter a problem I have flexing my foot upwards at the front. This makes it painful walking uphill and on steep hills I have to go up on tiptoe. Although many shoes have 'heels', they do not raise the heel much above the toe of the shoe. By attaching these to a standard pair of hiking shoes I am now able to walk much easier and without any pain.<br /><br />They are advertised as size 14 (US) but they are actually slightly small on my size 13 shoes. Overall, they measure 3.4"  wide, 3.5" long and give a lift of 3/4". They don't exactly conform to the shape of my shoe heel, but they work fine. They are easily attached using the nails provided and Shoe Goo, or similar adhesive.  I used two G-clamps to hold them while the glue set. Several pairs of these heels have now stayed firmly attached and outlasted the shoes.<br /><br />UPDATE (Sept 2021): Please be aware that the new supplier of these does not ship nails with them. The old supplier, Leather Care Supply used to ship a pack of the correct nails with the heels. The nails are hard to obtain elsewhere,