Product Description Product name: Conctete 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 is used for building and we can provide our customers with different kinds and lengths concrete screw.