The slotted liner or screen is the mechanical device that contains the gravel-pack sand in an annular ring between it and the casing wall or open hole. Figure 1 shows a schematic of the function of a slotted liner or screen in an openhole gravel pack. Slotted liners are made from tubulars by saw-cutting slot configurations, as shown in Figure 1. Slot widths are often referred to in terms of gauge. Slot or screen gauge is simply the width of the opening in inches multiplied by 1,000.