Dear customer, thanks for your comment but perhaps you are used to seeing low cost and low quality equipment: our set, especially in the first example shown in this video with the M12 and M14 connection for all common rail threads, allows you to work perpendicularly giving the impact with the sliding hammer, and with the other arm operate on the handle to force the injector into its seat from the coking residues. This kit (with the 1,5 kg hammer included) is tested to be effective on 80% of injectors in the automotive market, after which for extreme cases in which welds form between injector and cylinder head, we have the most professional and complete kit on the market, GO405 and hydraulic cylinder (in the hydromechanical or hydraulic + hydraulic pump). Regards