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7.5*52-212mm Torx Self Tapping Window Frame Screws Vis Concrete Big Head Plum Groove Cement Nails Tornillos Parafuso Schroeven YJT 4052 SOA-032 Wholesale@Retail SOA-M3 (O/D 4Wholesale&Retail 7. 5x52 212mm Window Frame Screw Concrete Screws High carbon steel quenching and hardening Big head plum groove cement nail Due to too many specifications and models, if there are specifications and models published missing, or you can not find the size specifications, please contact our customer service. thank you!