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Defense Series 

Collapsible Sai

Designed from the ground up as an implementation of the Okinawan Sai that would be practical to carry and self-sheathing.  The Handle slides to eclipse the blade's  edges and point, and make an integrated sheath.  It's one-button locking mechanism is designed to engage at either position, opened or closed, and must me pressed to release from either end.

 The UPK-Di Pocket Sai is ALL HARDENED STAINLESS STEEL

• 154CM Stainless steel Blade milled in-house from US sourced material
• 450 H900 stainless Steel Handle
• Custom made 450 H900 Stainless steel Hardware(Button and screws)
• 301 Stainless Steel Springs

Finishes

BrightMetal (Silver) Finish - the raw milled heat treated stainless blade and handle are tumbled and polished before being micro ball peened, a process used in aerospace fabrication to reduce fatigue cracking and propagation in critical components.  This process requires a spherical media that is harder then the component and produces a  resilient micro orange peel effect.  This surface goes further to withstands scratches.

Traditional vs. Double edged Dagger option

Traditional - The original Okinawan Sai is not a sharpened weapon, its defensive and non-lethal techniques were used by Okinawan police to control and subdue, noting that the saki(point) or yoku(prongs) offer pointed tips that would be used when a more lethal need arose.  For this reason I chose to shape the monouchi(main blade) of the Pocket Sai with facets that draw to a point at its end giving it a more ominous look.  In respect to the traditional Sai and recommended to those that would train in handling it, the Traditional version of the Pocket Sai is unsharpened, and has edges that are slightly rounded, this does provide a better resilience to weapon on weapon impact in melee control techniques. 

Dagger - My Hand ground technique is 400 grit, then 1000 grit wet silicon carbide belts, the water cooling ensures the edge never heats up and looses its temper so it will retain the upmost edge retention.  The milled blades are 154CM Stainless HT to HRC 61+/- 1HRC.  I polish the edge to a near mirror as a last step.  The collapsible design was always intended to eclipse the blade and create its own sheath for this reason, to safe the sharp edges of a dagger.

Specifications:

• Blade Milled from US Sourced 154CM Stainless Steel
• Heat Treated w/ Cryo HRC 61+/-1HRC
• Handle made in 450 Stainless Steel Heat Treated
• Heat Treated HRC 45
• Custom Hardware(Button and screws) made in 450 H900 Stainless steel
• Heat Treated HRC 45
• 301 Stainless Steel Springs
• Hardened Spring Temper

Dimensions

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