Bohle Professional Leather Handle Mill Putty Knife with a thick broad back blade. The high carbon steel blade extends through the handle. It features a leather handle that is attached with brass rivets. Designed for use with a hammer to remove tough putty from sash and window frames. Blade 4" (100mm) long x 1-5/8" (30 mm) wide x 3/16" (5 mm) thick.