Check the listing for details. Steelweld Shears shim for back Gauge nut. Condition: Used. Listed at 10.00 USD. The Steelweld Shears shim for back Gauge nut is a precision metalworking tool used in sheet metal shears. Designed to provide accurate and consistent results, this shim ensures proper alignment and positioning of the back gauge nut for precise cutting of metal sheets. It is a must-have for professionals in the CNC, metalworking, and manufacturing industries who require high-quality equipment to achieve precise and reliable cutting results.