1. Thread Converter / Adapter M16x1 LH Female to 0.578x28 (37/64"-28) Male 
  2. 35 mm /1.4" Length
  3. Diameter of Internal Hole : 11.7 mm / 0.46"
  4. Steel , Black

NOTE:

* Total 13 sizes Barrel thread to 0.578x28 (37/64"-28) Male Converters are sold online under TUFFORCE Brand as list below,      
** All international shippig is available without refund if lost outside USA.
*** Shipping from Livonia, Michigan, USA