Porous Surface Grinding Wheels Selection Chart SIZE GRIT HARDNESS AS3 Ceramic 32A RA Ruby PA Pink Unit Carton 7 x 1/ 2 x 11/ 4 T1 46G12 34249 37786 59080 10 20 7 x 1/ 2 x 11/ 4 T1 46H12 34250 37787 59081 58062 10 20 7 x 1/ 2 x 11/ 4 T1 60H12 34251 37788 59082 58063 10 20 8 x 1/ 2 x 11/ 4 T1 46G12 34252 37789 10 20 8 x 1/ 2 x 11/ 4 T1 46H12 34253 37790 59084 58065 10 20 8 x 1/