For securing wooden, plastic and aluminium window and door frames to concrete, lightweight concrete, solid brick, sand-lime brick, autoclaved aerated concrete, natural stone and other pressure-resistant solid materials, vertically perforated brick, perforated sand-lime brick and hollow lightweight concrete blocks.

Special screw for anchorless window installation Half-round head turbo screws K12.5 are suitable for low-tension spaced installation of window frames made of wood, plastic or aluminium in concrete and masonry. The visually appealing half-round head is neatly positioned against the window frame.