This Tekton 3/8 Inch Drive Flare Nut Crowfoot Wrench Set features a complete range from 5/16 to 3/4 inch. The sizes of our flare nut crowfoot wrenches scale optimally with fitting depths to achieve the best possible combination of engagement, access, and strength. Our design is leaner than conventional 6-point crowfoot wrenches, giving you more room to work in tight spaces. The wrenches are abrasive blasted to create a smooth, satin finish. Our electroless nickel plating process applies a uniform, corrosion resistant coating to the entire tool surface. Each crowfoot wrench has a permanent high-contrast size marking engraved on the side. This set includes a portable wrench key, molded in the USA from a high-quality polypropylene material that is durable and easy to clean. The wrenches are made entirely in the USA with USA-sourced materials. Most of the steps, including machining, broaching, blasting, plating and engraving, take place at Tekton's manufacturing facility in Grand Rapids, Michigan.