Wrench ya pneumatic ndi mtundu wa chida cha pneumatic, chifukwa phokoso likamagwira ntchito ndi lalikulu kuposa phokoso la mfuti, choncho dzina.Gwero la mphamvu zake ndi mpweya woponderezedwa ndi mpweya wa compressor.Mpweya woponderezedwa ukalowa mu silinda ya pneumatic wrench, imayendetsa choyikapo mkati kuti chizungulire kupanga mphamvu yozungulira.Kenako cholumikiziracho chimayendetsa gawo lolumikizira lomwe lidalumikizidwa kuti liziyenda ngati nyundo.Pambuyo pa kugunda kulikonse, zomangirazo zimamangidwa kapena kuchotsedwa.Ndi chida chothandiza komanso chotetezeka chochotsa ndikuphatikiza zomangira.Mphamvu yopangidwa ndi wrench yaikulu ya pneumatic ndi yofanana ndi mphamvu yomwe akuluakulu awiri amagwiritsa ntchito kuti akhwime wononga ndi wrench yomwe ili yaitali mamita awiri.Mphamvu yake nthawi zambiri imakhala yolingana ndi kuthamanga kwa mpweya wa kompresa, ndipo kupanikizika kumakhala kwakukulu.Mphamvuyi ndi yaikulu, ndipo mosiyana ndi yaying'ono.Choncho, amagwiritsidwa ntchito m'njira zosiyanasiyana
zofunikira zamakampani.Ndizoyenera malo aliwonse pomwe pakufunika kusokoneza ndikuyika zomangira.