Genuine sewing machine 3-1/2″ long triangle key appears to be brass. Unknown model. Three times as big as most home sewing machine keys.

The Genuine 3-1/2″ long sewing machine table or case triangle key is designed for durability and compatibility with various sewing machines. Its size, being three times larger than standard home sewing machine keys, provides enhanced leverage and control. The brass-like appearance suggests resistance to corrosion, ensuring longevity in your sewing toolkit.