Product name:Concrete screw,window frame screw Specification:7.5x42 ----7.5x212 Packing:In cartons or bulk, Head:Torx head T30 Thread:Full thread, Surface:Yellow zinc plated, Material:Carbon steel, C1022 Original place:China Payment:FOB Shanghai Characteristics:Concrete screw( window frame screw)is used for building and we can provide our customers with different kinds and lengths concrete screw.