Block measures 3 3/4" x 3 3/4" x 3/4" A square Steel Bench Block has a 3-5/16" concave sphere for forming and the reverse side is smooth and flat, that can also be used for flattening. This steel Block is used by Jeweler's in fabricating parts and design work, metal working and crafts. Block is made of Carbon Steel, hardened 45-50HRC and grinded smooth on all surfaces (the hollow sphere as well) is Double sided with a smooth flat bottom surface. Hardened block should never be struck directly with a steel hammer Includes rubber base for reduction of vibration and nose. Easily flip from one site to the other. APPLICATIONS: Jewelry Making - Metal Smiths - Jewelry Arts - Bead & Wire Work - Hobby & Crafts - Leather-work - Watchmakers