Designed with inspiration from the Okinawan Sai, to be a defensive melee weapon that would be more practical to carry and self-sheath.  The Handle slides to eclipse the blade’s edges and point making an integrated sheath.  It's one-button locking mechanism is designed to engage automatically in the open or closed position and must be pressed to unlock it from either end.

 This version of UPK-D1 Pocket Sai is made in 100% HARDENED STAINLESS STEEL

Thrower - optimized for throwing, made in 440A high carbon martensitic stainless steel with a hardness of HRC37-40 makes a tough resilient stainless. It can take extreme abuse and offer a point of bending where harder alloys will break, making this ideal of throwing where the worst abuse takes place.

Traditional Sai- The original Okinawan Sai is a defensive melee weapon optimized for non-lethal techniques used by Okinawan police of feudal Japan to control and subdue, noting that the saki(point) or yoku(prongs) offer pointed tips that could be used when a more lethal need arose.  I chose to shape the monouchi(main blade) of the Pocket Sai with beveled edges that draw to a point at its end giving it a more ominous look and a more effective tip for its compact size.  In respect to the traditional Sai, the Pocket Sai is pointed without live edges, this provides better resilience to weapon-on-weapon impact during melee control techniques.  

Material Specifications:

• Blade Milled from 440A Stainless Steel
• Heat Treated to 37-40 HRC
• Handle made in 440A Stainless Steel 
• Heat Treated to 37-40 HRC
• Custom Hardware(Button and screws) made in 450 Stainless steel
• Heat Treated by Age Hardening to the H900 condition HRC 45
• 301 Stainless Steel Springs
• Cold work Hardened to a Spring Temper

Dimensions

• Extended length: 11.7 inches (297 mm)
• Collapsed length: 7.3 inches (186 mm)
• Weight: 0.5 lb (8 oz.)