These threaded inserts are made of Metal with galvanized technology on the , which has high hardness and is not afraid of abrasion. These inserts and taps have standard threads for repairing 14mmx1.25mm spark plugs. Tapping is efficient and labor-saving, very suitable for gasoline engines, generators, engines, etc. Material: Metal colour: silver+gold Package Contents: 12 x screw inserts 1 x M16 straight flute tap 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.