Hex Adapter: Male x Female, Metric to Metric, M10x1.00 Male Thread Sz, M12x1.25 Female Thread Sz, 6g

Aluminum male x female thread adapters are significantly lighter than steel and resist corrosion. They have a threaded stud on one end and an internally threaded female connector on the other end, allowing them to join opposite-gender fasteners with differing thread sizes.