1.Brass plug and coupler accessory kit or commercial projects 2.Compatible with 1/4-Inch NPT air compressors (compressor not included) 3.Durable design made with heavy-duty, quality materials Deep-knurled socket for a positive connection with ball-locking mechanism-14pcs Kit includes (2) 1/4 inch NPT female couplers, (2) 1/4 inch NPT male couplers, (4) 1/4 inch NPT female plugs, and (6) 1/4 inch NPT male plugs Color: Gold Material: brass Package Contents: 2 x 1/4NPT external tooth joint 2 x 1/4NPT internal tooth joint 4 x /4NPT internal tooth ferrule 6 x 1/4NPT external tooth ferrule Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.