DescriptionPlace insert on installation tool and position the adjustable ring so that the insert tang is centered in the tang slot. Wind the insert in with a light downward pressure until a half turn below the surface. Don't work against the thread direction as the tang could break.Feature- Color: random - Material: metal - Size: 1.6x1.4x1.4cm - The kit creates a stronger internal thread in metals and protects tapped threads against wear and damage - for restoring damaged threads in steel, cast, iron, and aluminum - Suitable for ignition plug repair and other automotive applications, for restoring the damaged threads. - Please check that the thread and pitch of the tap and the bolt match.Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!