Blade Material: Railroad steel
Sheath Material: Railroad steel
Guard: Stainless steel
Overall Length: 76 cm
Blade Length: 45 cm
Blade Thickness: 0.5 cm
Weight: 1.5 kg
Extended Length: 126 cm

Your description mentions an 'upgraded stick-sword,' a multifunctional tool combining sword and stick design, suitable for different situations. Here is an analysis of the different components of this design:

1. Blade and Sheath Material: Railroad Steel

   • Railroad steel is typically made from high carbon steel and other alloy elements to enhance its strength and wear resistance. Used for the blade and sheath, it offers excellent durability and cutting performance.

2. Guard: Stainless Steel

   • Stainless steel is commonly used in knife manufacturing for guard materials because it is corrosion-resistant and can prevent the hand from slipping onto the blade, providing extra protection in the design.

3. Dimensions and Design

   • Overall Length: 76 cm: This is a medium-length knife, making it easy to carry and maneuver in confined spaces.
   • Blade Length: 45 cm: Offers sufficient cutting edge for larger tasks while maintaining good portability.
   • Blade Thickness: 0.5 cm: This thickness can provide a robust edge while maintaining good cutting capability.
   • Weight: 1.5 kg: This weight is fairly appropriate for a 76 cm long knife, providing enough heft for chopping without being too heavy to maneuver.

4. Extended Length: 126 cm

   • The extended length refers to the length when fully opened or extended. This design allows the knife to be lengthened into a longer form, similar to a long staff or long sword, making it more versatile.

Overall, this design blends the features of a knife and a staff, making it adaptable to various use scenarios, ideal for those who need a multipurpose tool, such as outdoor adventurers or rescue personnel.