Specification: -Thread size: M8 x 1.25mm -Thread inserts material: Stainless steel -Thread tap material: HSS -Drill bit material: HSS -Drill out damaged thread using correctly sized drill bit -Tap re-drilled hole using tap supplied -Load coiled insert into applicator -Screw coil into casting -Using lug breaking tool, break off tag on insert -Thread is repaired and ready to use What you will get: -25xThread inserts -1xLug breaking tool -1xInstallation tool -1xWrench -1xThread tap -1xDrill bit The thread repair kit including thread inserts, drill bit, thread tap, insert installation, lug breaking tool, allow you have smooth repairing experience. Come with 25Pcs M8 x 1.25mm Wire Thread inserts, ideal for restoring damaged threads, stripped internal threads and creates a stronger internal thread in soft metals. Drilling clear the damaged threads with a standard drill. to repair a spark plug thread no predrilling is necessary if using the special spark plug tap, please pay attention that for fluteless taps bigger holes are required. Install the insert place 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. Dont work against the thread direction as the tang could break. Widely Use Ideal for repairing damaged threads or worn out threads, suitable for engine repair and other automotive.Can be used in daily repair, car repair, drilling machine.