Overview Reviews Product Description Spec Mix Fine Corefill Grout. 3000 psi. Available in 80 pound bags. Product Videos Custom Field Product Reviews Write a Review Write a Review × Spec Mix Spec Mix Fine Corefill Grout Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *