Seamless Connection, makes it possible to attach M42 and M48 accessories together. One side are M48X 0.75 Male and M42X1 Female thread, the other side is M42X 0.75 Male thread. Converts an M48 female or M42 male thread to a T2 male thread. This is a very high quality anodized aluminum adapter. All metal construction and anodizing aluminium process, durable for long time use.