CONFAST 1/4 in Drop-in Anchor Zinc Plated - Flush Mount Strength

Our review of the CONFAST 1/4 in Drop-in Anchor finds it best suited to professionals and serious DIYers who need a flush-mounted anchor that holds reliably in solid concrete. The single biggest reason to consider this anchor is its flush mount design combined with zinc plated carbon steel construction, which delivers a secure, unobtrusive hold for indoor, dry installations where the anchor must sit below the concrete surface. Installation requires a 3/8 in carbide bit and a hammer drill, and the box includes 100 anchors with one setting tool, making it practical for batch anchoring tasks.

Key Features

• Concrete-only design: The anchor is built specifically for solid concrete, providing predictable performance when installed to the recommended embedment depth.
• Flush mount finish: When set the anchor sits below the concrete surface so nothing protrudes above the slab, ideal where a smooth surface is required.
• Zinc plated carbon steel: The material and plating deliver strength and basic corrosion resistance suitable for dry, indoor environments.
• Defined hole size: Requires a 3/8 in hole drilled with a carbide tipped bit in a hammer drill, which standardizes installation and reduces guesswork.
• Minimum embedment: The anchor must be embedded at least 1 in into the concrete to achieve rated holding capacity and reliable expansion.
• Pack quantity and tool included: Supplied as 100 anchors per box and one setting tool, making it useful for larger jobs where multiple anchors are required.

Who It's For

This product suits contractors, maintenance crews, and experienced DIYers who work on indoor concrete floors or walls and need a low-profile anchor for machinery bases, fixtures, or equipment mounts. The flush mount and solid construction make it a good choice for applications where nothing should stick up above the concrete surface, such as buffing machine mounts or base plates.

It is not for use in hollow block, brick, or outdoor/wet environments; anyone needing anchors for masonry other than solid concrete or for exterior use should choose a different anchor type designed for those substrates and conditions.

Pros & Cons

Pros

• Strong zinc plated carbon steel construction provides reliable hold in solid concrete.
• Flush mount design keeps the concrete surface clear of protrusions for a neat installation.
• Clear drilling and embedment requirements (3/8 in hole, 1 in embedment) make installation repeatable.
• Good value for bulk work with 100 anchors per box and a setting tool included.

Cons

• Limited to dry, indoor use and only solid concrete, so it is not versatile for all masonry types.
• Some users report mixed installation experiences when the setting tool is missing, which can affect ease of use.

Specifications

Anchor diameter (inside)	1/4 in
Hole diameter / bit size	3/8 in
Minimum embedment	1 in
Material / Finish	Carbon steel, zinc plated
Intended base material	Solid concrete only
Environment	Dry, indoor use
Pack contents	100 anchors and 1 setting tool

Our Verdict

The CONFAST 1/4 in Drop-in Anchor is a practical, cost-effective choice for anyone anchoring into solid concrete indoors who needs a flush, low-profile result. It delivers dependable strength and clear installation parameters, and the bulk pack with a setting tool adds value for larger projects. Choose this anchor when working exclusively with solid concrete in dry environments and when a neat, flush finish is required.

Frequently Asked Questions

Can this anchor be used in brick or block?
No. These anchors are designed for solid concrete only and should never be used in block or brick base material.

What drill bit size is required?
A 3/8 in carbide tipped drill bit used in a hammer drill is required to prepare the hole for this anchor.

Is the anchor suitable for outdoor use?
No. The anchor is zinc plated and intended for dry, indoor environments, so it is not recommended for wet or exterior applications.