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Zinc plated steel. DIN 1.0338 / SAE 1008/1010.
6 x Sizes (Ø Range): 3/8″ (8 – 11 mm), 7/16″ (9 – 11 mm), 1/2″ (11 – 13 mm), 9/16″ (13 – 15 mm), 5/8″ (15 – 18 mm), 3/4″ (17 – 20 mm).
