3/4'' Shank 4''L AUDIBLE Precision Electronic Edge Finder CNC Milling lathe Electronic AUDIBLE edge finder Diameter of holding bar: 3/4'' Shank Length: 4'' ; Accuracy: 0.0005" ;Highly visible lights ; Batteries NOT INCLUDED Wooden case INCLUDED; Wooden case dimension: 2-1/2''L x 5-1/2''W x 1-1/4''H Quantity: 1 ;Shipping Weight: 8 ounce