A blood lancet, or simply lancet, is a small medical implement used for capillary blood sampling. A blood lancet, sometimes called a lance, is similar to a scalpel style lancet, but with a double-edged blade and a pointed end. It can even be a specialized type of sharp needle. Lamore...
First, the blade has the "lamb's foot" shape that features a straight cutting edge and a sharp point. Secondly, the knife blade is beveled on one side and flat on the other. This means a grafting knife is sharped on the beveled side  only, much like you would sharpen a chisel more...