North Star Universal Bat 860The Universal Insert Bat, which saves a great amount of shelf space when making pieces with a small "footprint". The outer bat is 1 2 inch thick medex and the inserts are 1 4 inch thick which fit flush with the top of the outer bat. The inserts in 13 inch bats are 5 1 2 x 5 1 2 inches. Inserts remove easily yet fit snugly enough that the cavity stays free of clay and slurry.