Viti per calcestruzzo punta diamantata testa esagonale 1/4" x 1-1/4" per ancorare muratura, blocco e br
A 3/16” screw requires a 5/32” hole and a 1/4” screw requires a 3/16” hole. The concrete screw is inserted into the hole and turned either by hand or by a rotation drill until the concrete screw is tight against the fixture being fastened.