These higonokamis are universally popular as a do-everything penknife. The Japanese-equivalent to the Swiss Army Knife in terms of popularity, they were originally used to sharpen pencils but can be used in almost any crafting task and for household jobs, particularly box opening. 

Pictured top left to bottom right: Handmade brass, regular brass, black mono and mini brass. 

Handmade brass: 7.5cm blade; 17.5cm unfolded length

Regular brass: 6.5cm blade; 15.5cm unfolded length

Black mono: 6.5cm blade; 15.5cm unfolded length

Mini brass: 3.5cm blade; 9cm unfolded length