Thread Size: 0.25" (6.3mm), Head Diameter: 0.48" (12.4mm), Overall Length: 2.25" (57.3mm), Thread Length: 1.8" (45.9mm). Specification: 50 PCS 1/4 x 2-1/4 Inch Flat Phillips Head Concrete Screws, with a drill bit and a screwdriver bit. Material: Made of high-quality carbon steel, and the surface of the screw is treated with Blue Ruspert, which has strong corrosion resistance. Performance: The Concrete Screws are hardened to a high temperature for exceptional hardness, anti-rust property and corrosion resistance; The high-low thread design provides strong fixing ability, and the sharp tail makes drilling faster. Application: Suitable for a various of masonry materials such as concrete, masonry, brick, block, stucco in your home and workplace yard for quick installation. High Quality Material

The Concrete Screws are made of high-quality Carbon Steel, and the surface of the screw is treated with Blue Ruspert, which has strong corrosion resistance; They are hardened to a high temperature for exceptional hardness, anti-rust property and corrosion resistance.

Flat Head Design

Our Flat Head Concrete Screws feature a deeply slotted Phillips head that can be driven with a Phillips screwdriver bit.

High-Low Thread Self-Tapping Masonry Screws

The high-low thread design provides strong fixing ability, and the sharp tail makes drilling faster.

How to Use Concrete Screws

Step 1: Pre-drill a suitable hole
Begin by drilling a hole using the provided drill bit - concrete screws should be embedded in the base material to a depth of 1" to 1-3/4", and ensure the hole is 1/2" deeper than the screw embedment for a smooth installation.

Step 2: Secure with Concrete Screws
Drive the Concrete Screw into the hole perpendicularly.
Note: Excessive torsion leads to screw head separation or thread stripping in the base material.

Step 3: Installation Completed
The installation process is simple and convenient, you can also easily remove it when needed.