It's 0.5 cm.
The product is a perfect fit.5 cm difference in sizes. It's 100% handmade. Product Color: Black Fit : Full Fit / Standard Outer Material : Faux Leather Inner Material : Imitation Leather / Warm Lining Heel Length : 7 cm Sole Material : Neolite Sole Place of Production : Turkey The collar width is 26 cm for a size 38, leg length 13.