Features - SAE Set - Heavy Duty - Heat-Treated - Rust-Resistant - Tungsten Steel Construction - Precision Machined To Exacting Standards - Precision Ground And Polished Surfaces, Facilitate Chip Removal - 20 Pcs Tap & Die Coarse Threads Sizes: 2-1/4NC20, 2-5/16NC18, 2-3/8NC16, 2-7/16NC14, 2-1/2NC13, 2-9/16NC12, 2-5/8NC11, 2-3/4NC10, 2-7/8NC9 & 2-1NC8 - 20 Pcs Tap & Die Fine Thread Sizes: 2-1/4NC28, 2-5/16NC24, 2-3/8NC24, 2-7/16NC20, 2-1/2NC20, 2-9/16NC18, 2-5/8NC18, 2-3/4NC16, 2-7/8NC14 & 2-1NC14