Upon its introduction in the mid-1600s, the slip joint design gained popularity among scholars and merchants, who used the blades to sharpen writing utensils, hence the term “penknife.” Considering it ...

A slip joint works because of a piece of metal called a rear spring that exerts tension on the blade's tang to keep it open or closed. A slip joint, however, isn't a true lock for a knife ...

The WESN x P&Co Slip-Joint Microblade comes with a brass lanyard bead, tying together the heritage aesthetic. The co-branded blade is made from tool-grade D2 steel, and the handle is made from brass ...

The Ellis Slim handle measures 3.5 in (8.9 cm) long, and the 2.6-in (6.6-cm) blade opens with help from a slip joint for a total deployed knife length of 6.5 in (16.5 cm).

The smaller Jr. is about as simple as they come, with a single surgical-steel blade that unfolds on a slip joint in the plastic handle. Masamoto VG 8.2-inch Gyutou. Media Platforms Design Team.