Since it is a pair of glasses on both ends, it is suitable for tightening work. JIS certified product (size up to 24 x 27 mm). Tightening work with hex bolts and nuts. Total length: 12.4 inches (314 mm). Opposite side dimensions: 0.7 x 0.9 inches (19 x 22 mm). Plate thickness: 0.4 inches (12 x 12 x 12 mm). Special steel. Surface treatment: Nickel chrome plating.