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21 Wrenches: Snap On, SK Tools, MAC Tools, FACOM, Sunex, Gedore, Proto, Wright Tools, Matco, GearWrench, Williams, Klein Tools, Kobalt, Crescent, Tekton, Craftsman, Performance Tool, GearWrench 6 point and 12 point, Pittsburgh and a vintage S K wrench. The box end of the combination wrenches are compared for performance on a rusty fastener with limited contact area and on ½ inch low and high carbon steel with full box end contact.. The open end of the wrench is compared for performance on a low carbon steel fastener as well as on high carbon steel. I always purchase all of the tools and supplies used to test the products to ensure unbiased comparisons. So, thank you for supporting the channel.