Ideal for restoring damaged threads, suitable for engine repair and other automotive. Applications for steel, cast iron and aluminum. Can be used in daily repair, car repair, drilling machine, etc. Made of material, sturdy and durable in use. Wrench: surface electrophoresis Thread specification: M3x0.5mm/M4x0.7mm/M5x0.8mm/M6x1.0mm/M7x1.0mm/M8x1.25mm How to use: 1.Drill out damaged thread using correctly sized drill bit(supplied) 2.Tap re-drilled hole using tap supplied 3.Load coiled insert into applicator 4.Screw coil into casting 5.Using lug breaking tool,break off tag on insert 6.Thread is repaired and ready to use. Suitable for engine repair and other automotive applications, for restoring the damaged threads. Due to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal use Colour:Photo Color Material:High Speed Steel Package Contents: 1 set x M7x1 repair tool 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.