Specifications include, but are not limited to: SNOWPLOW BLADES, 48" LONG, C-1090 CARBON STEEL, 5/8" THICK SQUARE EDGE FLAT WITH NO BEVEL, 21/32" SQUARE PUNCHED HOLES FOR USE WITH 5/8" CARRIAGE BOLTS. BLADES WITH COUNTERSUNK HOLES FOR USE WITH PLOW BOLTS ARE NOT ACCEPTABLE. (TOLLWAY ITEM #I-115310) SNOWPLOW BLADES, 60" LONG, C-1090 CARBON STEEL, 5/8" THICK SQUARE EDGE FLAT WITH NO BEVEL, 21/32" SQUARE PUNCHED HOLES FOR USE WITH 5/8" CARRIAGE BOLTS. BLADES WITH COUNTERSUNK HOLES FOR USE WITH PLOW BOLTS ARE NOT ACCEPTABLE. (TOLLWAY ITEM #I-20126) SNOWPLOW BLADES, 72" LONG, C-1090 CARBON STEEL, 5/8" THICK SQUARE EDGE FLAT WITH NO BEVEL, 21/32" SQUARE PUNCHED HOLES FOR USE WITH 5/8" CARRIAGE BOLTS. BLADES WITH COUNTERSUNK HOLES FOR USE WITH PLOW BOLTS ARE NOT ACCEPTABLE. (TOLLWAY ITEM #I-20127)