Mac Tools offers the Knuckle Saver Wrench, with design enhancements that provide improved strength, durability, corrosion resistance and cleaning capability. The wrenches combine the Knuckle Saver anti-slip feature in the open end with a longer standard length and a new shank design with a curved side edge. Available in Metric 15-piece (SCB15K2KS); 10-piece (SMB10KKS); 14-piece (SMB14KKS); 19-piece (SMB19KS); 10-piece (SMHB10KS); and 5-piece (SMB5KS); and in SAE 18-piece (SCB182KS) and 7-piece (SCB7PTKS).