Name:Stainless Carbonation Cap Product Type: Carbonation Equipment Type: Ball Lock Type Usage: fit soft drink PET bottles Size: 5/16 inch Length: 60mm Material:304 stainless steel colour:Silver Package Contents: 2 * stainless carbonation cap 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.