SPARIBO®, chipboard screw, flat countersunk head, 4.0 x 25, partial thread, TX 20, steel, galvanized, blue passivated, 1,000 pieces.Area of application:Connections made of wood and aluminum in interior areas.Area of application:Interior fittings, frame screw connections, fence constructionNotes:Calculable safety with the REISSER dimensioning software.Advantages / Claim:The drilling screw