Irwin Hanson High Carbon Steel 1/4 -20NC, 1/4-20NF, 5/16-8NC, 5/16-24NF, 3/8-16NC, 3/8-24NF, 7/16Irwin Hanson High Carbon Steel 1 4 20NC, 1 4 20NF, 5 16 8NC, 5 16 24NF, 3 8 16NC, 3 8 24NF, 7 16 Brand Name: Irwin Sub Brand: Hanson Material: High Carbon Steel Metric or SAE: SAE Product Type: Tap and Die Set Tap Size: 1 4 20NC, 1 4 20NF, 5 16 8NC, 5 16 24NF, 3 8 16NC in. Number in Package: 24 pc. Usage: IRWIN Taps and Dies are great for routine maintenance, repair work and for re threading where high accuracy and tolerance thread is not critical.