Grandfather Clock Door Key Howard Miller and the modern day Clocks Best replacement reproduction antiqued brass plated hollow barrel skeleton key. This key will fit most of the Howard Miller, Sligh, Pearl, Colonial, Seth Thomas and some Ridgeway Clocks. Overall Length: 3 3/16". Shaft Length: 1 1/2". Bit: 3/16" Wide and 3/16" Tall Inner Barrel Diameter: 1/8"