Overview Product Description Grade - 10.9 grade 8. Finish - Yellow zinc plated steel. Thread - UNF (Fine thread) Spanner size - 3/4" Thread size - 1/2" - 20 tpi All lengths are fully threaded,. Product Videos Custom Field Product Reviews Write a Review Write a Review × 1/2" UNF 10.9 GRADE 8 ZINC YELLOW HEX SETS Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *