Springfield Leather Company 8" Curved Round Bone Creaser 8" Round Genuine Bone Creaser Rounded on each end. Made from genuine bone. Made of real bone, this creaser can make a big difference when assembling your leather projects. Creasers are often overlooked as being a useful tool. It has many uses: smoothing, creasing, forming leather, adhering cemented leathers, burnishing edges, etc... An indispensible tool for making holsters and cases.