The main difference is that the body set of ARP-1512 has a structure of detachable welded design.
When using thicker wire, the center pin and wire can be welded independently before assembling the body set to prevent the plastic body from melting due to excessive welding time.

Based on our understanding, RCA plugs cannot achieve the standard 75-ohm characteristic impedance due to interface dimensions. 
Hence, we have not included impedance characteristics on our website. 
Impedance mismatch has minimal effects on short-distance, low-frequency applications and may not result in significant losses. In some cases, it may even go unnoticed.