Due to count­less pos­si­ble appli­ca­tions, pro­tec­tive caps and plugs must have the most diverse geome­tries. A ver­sion with­out thread is suit­able for pro­tect­ing pro­trud­ing com­po­nents (screw heads or nuts), as these can be fit­ted com­par­a­tive­ly eas­i­ly and removed again if nec­es­sary. Plugs with­out threads can be used for per­ma­nent use in drill holes or oth­er open­ings, but are dif­fi­cult to remove again. Screw plugs or seal­ing screws are suit­able here. These are screwed or unscrewed direct­ly into or out of the intend­ed open­ing and thus allow easy removal. A fur­ther pos­si­bil­i­ty is pro­vid­ed by so-called strap plugs, which are fas­tened for quick assem­bly by sim­ply press­ing on them, but can be removed just as eas­i­ly through the exist­ing strap.