Irwin Hanson High Carbon Steel Bottom Tap *Sub Brand: Hanson *Material: High Carbon Steel *Metric or SAE: SAE *Product Type: Bottom Tap *Tap Size: 5/16 in.-18NC *Number in Package: 1 pc. *Usage: IRWIN Taps and Dies are great for routine mainten *Length: 8.5 in. *Thread Type: NC *Packaging Type: Carded *Ideal for threading close to the bottom of blind holes