The diamond awl, also known as a rhombus awl, is used to pierce leather before saddle stitching (hand sewing leather). Unlike a round awl, which makes a "round" hole, the diamond awl creates a diamond-shaped hole to facilitate needle passage and ensure the correct angle. For optimal use, we recommend sharpening the blade with a strop and sharpening paste. Our top pick in this category: Jérôme David awls, which effortlessly pierce through leather!