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The Master Kuo G5 Extra Large Taiwan Tuna Knife is designed for cutting the heads off of large fish and for cutting the body into steaks. It is used by pushing the heel of the blade into the fish and then rolling the blade forward to finish the cut, or zipping through long lateral cuts.

This knife is made with 3 layered laminated steel. The outer steel is stainless while the inner core steel is a traditional Japanese High Carbon SK5 steel, and has a RC hardness of 60-61.


  • Blade: 250 x 150 x 3.5mm / 9.8 x 5.9 x 0.13″
  • Handle Length: 100 mm / 4″
  • Overall Length: 305mm / 12″
  • Weight: 640g / 22.5 oz (1.4 lbs)

Knife care: Keep clean with warm water and soap. Towel dry immediately. Do not put into dishwasher. Stainless clad outer steel will not rust, but exposed SK5 core edge steel can show signs of surface rust over time. Most surface rust can be removed by sharpening the edge.


g series family
Master Kuo G Family

Master Kuo knives are some of the sharpest factory sharp knives we’ve ever seen, but they are capable of even more after our professional sharpening services. We recommend the 2000 and 5000 Grit services for this knife. You can also add a custom made leather sheath.


Weight 2 lbs
Dimensions 14.5 × 8.5 × 1.5 in

Master Kuo


Master Kuo G series

1 review for Master Kuo G5 XL Taiwan Tuna Knife – Big Fish Knife

  1. Christina

    I bought this for my boyfriend along with the custom sheath. Everything was perfect, and my boyfriend absolutely loves the knife! Thank you!

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Shipping to USA

Most Domestic USA orders ship within 72 hours of ordering from our Colorado location via USPS. You can track your order from this Link

Shipping International/ outside of USA

Most International orders ship within 72 hours of ordering from our Taiwan location via Chunghwa Post. You can track your order from your countrys postal website or from this Link

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