All-inclusive Set: with the inclusion of 100 pieces of 1/4 x 2-1/4 hexagonal head concrete screws and a 3/16 inch drill bit, this package saves you time and money with all the necessary tools provided in one package Durability Material: crafted from quality carbon steel, the masonry screws fight off hydrochloric acid corrosion, and endure high-temperature quenching; With a surface treatment of blue rust, they boast corrosion resistance, and not easily break or damage Quality Construction: brick screw is hardened at high temperatures, promising excellent hardness; High-low thread design provides strong fixing ability while diamond tail accelerates drilling speed for easy penetration into most surfaces or base materials Washer Head Design: our self tapping concrete screws feature a hexagonal washer head design, preventing slipping under force application; This design allows for easy and quick embedded into substrates like cement and concrete without needing other anchors Wide Application: the masonry anchors for brick and masonry screws for concrete are ideal for various environments, including home, workplace, furniture, and yard; Suitable for concrete, masonry, brick, stucco, etc., they can quick installation, firm use, and easy removal, ideal for repair and decoration ASIN B0F327CVPC Brand MorningRo Color Hex Head Model HUI-MorningRo-2061 Set Name MorningRo 100 Qty 1/4 x 2-1/4 Hex Head Concrete Screws Anchor Head Type Hex Size Name 1/4 x 2-1/4 Metal Type / Unit Count 100.0 Count Part Number HUI-MorningRo-2061 Thread Size 1/4 Thread Type Hex Flat Drive System Slotted Finish Types Blue Coated Manufacturer MorningRo Thread Class Standard Thread Style / Fastener Size 1/4 x 2-1/4 Fastener Type Screw Item Diameter 6.35 Millimeters Material Type Carbon Steel Exterior Finish / Item Dimensions 4.72 x 3.54 x 2.56 inches Number Of Items 100 Thread Coverage Partially Threaded Number of Pieces 100 Outside Diameter 6.35 Millimeters Screw Head Style Hex Screw Point Style Diamond Point Set Screw Thread Type Hex Flat Compatible Groove Diameter 0.25 Inches