These beautifully designed and engineered clocks feature solid brass case and bezel construction, a movement made by a major watch manufacturer, and come in six unique styles. All fit-ups feature an improved silicon gasket for positive mounting into a 1-3/8" dia. x 9/32" deep recess. Styles may be combined for a discount! 1-3/8" Clock Fit-up Bit. Economical bit is perfect for drilling holes for 50mm fit-ups.