This threaded steel adapter from DoctorSpark allows for easy conversion of an M12 female thread to M16 male. With a total height of 32mm and a weight of 50g, this hexagon-shaped adapter is made of durable steel and has a flat head and zinc plated finish. The spanner tool width is 19mm, while the male stud length is 11mm and the female insert length is 10mm. Additionally, this adapter features a coarse metric thread system of measurement with a thread pitch size of M12 - 1.75mm M16 - 2mm, and a clockwise (right hand) thread rotation. Made in the United Kingdom, this threaded steel adapter makes a very secure connection.