Univen Heavy Duty Glass Percolator Knob Top fits Coletti Bozeman and Coletti Butte 9, 12, and 14 cup percolator coffee pots. Set of 2 durable, heat-resistant, dishwasher safe glass knob tops. Overall height is 1.25" (32mm) Shaft diameter at top of knob is 1.10" (28mm) Fits holes in diameter of 1.16" (29.5mm) Please check the measurement before ordering.