Chris. for burnishing I like to use a wood one better than metal. use cocobolo or ligtim vital(I am not sure of the spelling also called iron wood) because of the natural oils in the wood help to burnish the edge. I use a cocobolo wheel that has a groove on the side and have it where I can mount it on my buffer and that burnishes my project perfect, If I have a project that I can not use the buffer, I have several sticks that I have made just for that purpose. Another thing that helps, is to use gum tragacanth to help the smoothing process. can be found in most hobby stores.The wood creasers that I use and make have a more concave end so that it smooths the leather and does not leave a crease in the leather, The doubles sided metal is used to create lines on the side of the leather for either to compress the edge of the leather or for the line effect it creates. it is not for burnishing purpose.the wood one is used in the saddle and shoe industry to leave a crease in the leather and is also not used for burnishing. for burnishing you need a wood or bone burnisher that has a wide smooth valley in the end of it.Gary