SNSS-M6-10-RY NBK Socket Head Cap Screws Low Temperature Black Chrome. Made in JapanSNSS M6 10 RY NBK Socket Head Cap Screws Low Temperature Black Chrome. Made in Japan Excellent corrosion resistance, chemical resistance, and abrasion resistance. Due to low outgas, screws can be used under vacuum environments. The coating has excellent lubricating ability and is suitable for prevention of seizing. Spectral reflectance is 1. 5% or less. These screws are intended for optical instruments and other applications that require