Not to be dis-respectful, but your end result should be what the catalog says your buying or say +/-. Using the Model 4 as an example the 4.5" is to be 3/16 and the 5" to be 1/4 with a price difference. So you would buy the size that fits the function you plan to perform. I am not trying to bash the product as I am amazed at the quality, fit and finish of the Randall knife. Just having a conversation. Please do not take it the wrong way!