Concrete screws feature a Torx (plum blossom) recess and thicker thread design to improve holding power and reduce drifting during installation; they are described as durable and corrosion resistant for versatile construction uses, with listed size examples at D=7.5 mm and multiple lengths. Manufactured and supplied from the company’s Vietnam operations (Thu Dau Mot, Binh Duong) for export sourcing. Product Dimensions: