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The Martin Tool Metric Check Nut Wrench – 24mm is drop forged from steel bar and is available in a range of sizes, including fractional sizes from 1/2” to 1-11/16” and Metric sizes from 10mm to 41mm. These industrial black wrenches are designed for use on check nuts, stop nuts, jam nuts, and hydraulic fittings. The smaller sizes are perfect for complementing service wrenches. (Also known as Thin Head Wrenches) These single end wrenches have a 15 degree angled slotted opening and are specially designed for servicing thin adjusting and/or lock nuts. They are constructed with a Steel material and coated in Industrial Black. Proudly Made in the U.S.A.