The parts of the Oh S#IT Kit are housed in a tin with a magnetic base that keeps all the parts sorted. On the inside of the lid is a to-scale image of all the included parts so you can easily identify each spare part.From screws to pins to detents the RISE Oh S#IT Kit contains spare parts that can be impossible to find if dropped.This parts kit includes: Buffer Retainer (x1) Buffer Retainer Spring (x1) Anti-Walk Pin Screws (x2) Takedown & Pivot Pins Detents (x2) Takedown & Pivot Pins Springs (x2) Safety Selector Detent (x1) Safety Selector Spring (x1) Firing Pin Retainer (x1)