Overview Product Description Thread - UNF. Grade - Grade 8 (10.9) Material - Yellow zinc plated steel cr6. Thread size -3/4 inch - 16 tpi Spanner size - 1 1/8 inch Product Videos Custom Field Product Reviews Write a Review Write a Review × 3/4" 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 *