Here is a photo of my newest trimming tool. It is a Japanese style trimming tool called a Kanna. This one is 8-inches long with a wooden handle.
The blade is just 3/4-inch steel strapping band that I cut with tin shears and then bent in a table vise. I used a Dremmel tool with a stone tip to shapen the edges. The two halves of the wooden handle are oak, which were glued to the metal blade and then stained and polished.