RUSkey New for 2022! Developed by Karl OscarDelta the RUSkey is no bigger than a thumbnail to aid carry and concealment on your person. The RUSkey works on Russian BRS-2 and other handcuffs that share a similar flat key: - Czech Alfa-Proj/RALKEM 9921- 9930 - BREN BRNO - Slovakian Puta/AFG - Walther 302 - Japan Manchu 331182 - Chinese Anhua HC-13W. Corrosion resistant 304 Full Hard Stainless Steel that differs from other forms of 304 in that it has been hard cold rolled to its full hard condition. This increases its fatigue life. In its full hard condition, type 304 stainless steel has a tensile strength of 185,000 PSI minimum, and a minimum yield strength of 140,000 PSI.