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Martin’s single-end flare nut wrenches are used for hydraulic, pneumatic and HVAC applications and feature a 7-degree, 12- point opening. The 12-point hex open box slips over the line and onto the fitting. More contact means less chance of slipping, and the wrenches also work well in tight quarters. The wrenches are available in 16 inch sizes from 3/8” to 1-1/2”.