Safety pins are an essential component in the world of dry fire, offering unmatched security. Their reliability, combined with ease of assembly, ensures that everyone can use them with confidence and ease. We are excited to announce that this innovative component is now part of our TR-1 product line, produced using advanced injection molding technology, ensuring precision and high quality. 9x19/9x21/9X17 Caliber compatible. Length 132mm (can be cut). The package contains different O-rings based on the caliber.