5/8" Face Dia. Mallet with Detachable Face Versatile hammer with interchangeable face to provide any combination desired. Supplied with two different faces and wrench to tighten or remove collars. 37-582 hammer supplied with brass and fiber faces; face diameter of 5/8" (16mm); head length of 2-5/8" (67mm); head weight of 5 oz (142g). 37-584 hammer supplied with brass and nylon faces; face diameter of 5/8" (16mm); head length of 2-5/8" (67mm); head weight of 5 oz (142g).