ESAB 693000002 Features: -Price Is For One Box -Minimum Order Of 1.-Refrac-T-BackÂ® is a non-metallic ceramic material which is temporarily attached to the reverse side of a weld while helping to support a full penetration weld.. -The cost saving advantages are easily justified in both reduced labor and increased productivity. .-Part numbers and package options make selection easy.. -UNSPC CODE: 23171500. -Weld Backing Material Weld Backing Material misc. welding equipment backing materials.-RTB GVD 1X1X1/4. Dimensions: -1 H x 1 W x 0.25 D.