Filet weld gauges measures fast and accurate measurement of 11 fillet weld sizes. Blades are debarred to remove rough edges All sizes are engraved for easier and better reading Gauge blade must be flush to the base with Tip touching the vertical member. Use the single are corners for measuring convex welds. Use the double arc corners if the welds are concave ( Undersize ) /If they are more filler material is required to build weld throat to the size where the tip between the double arcs touch. Convex Weld: Place single arc edge flush to base material so blade tip touches vertical member the weld size is indicated Concave Weld: Place double arc Flush to base material so tip touches vertical member. If the tip between the double arc touches the centre of the weld the weld is the profile desired and is the size indicated