Research-based guide: We have not hands-on tested this model. Product specifications come from Milwaukee; the buying advice below is our editorial assessment. Checked September 20, 2026. This page contains affiliate links.
The buying decision
Choose the 3453-20 if your work is dominated by construction screws, cabinet fasteners, anchors, brackets, and other jobs suited to a 1/4-inch hex driver. Its main reason to exist is not simply torque—it is the combination of compact dimensions, fast bit changes, and drive modes in a tool that rides easily on a belt or fits between framing and equipment.
Pass if you mainly drill holes, install delicate hardware, or remove vehicle lug nuts. A drill gives you a chuck and a mechanical clutch; a torque wrench gives you controlled final tightening; an impact wrench uses square-drive sockets for automotive fasteners. The 3453-20 is a hex impact driver, and adapters do not turn it into every one of those tools.
What model 3453-20 includes
Milwaukee lists the bare tool and belt clip in the standard package. The manufacturer specifies a 1/4-inch hex collet, up to 1,500 inch-pounds of torque, up to 3,600 RPM in Mode 3, four-mode drive control, a self-tapping-screw mode, and three LEDs around the bit. Milwaukee states that the tool is 5 inches long and weighs 2 pounds.
Battery, charger, bits, sockets, and case are not listed with model 3453-20. Amazon sellers may bundle accessories, so read the written package contents rather than assuming the listing photos define the offer. Confirm that the model number on the tool and offer is 3453-20.
Where its small size actually helps
Compactness matters in cabinets, mechanical rooms, overhead work, between studs, and inside equipment where a longer M18 driver can bump the surrounding surface. Lower carried weight also matters during a day of service calls. Those advantages are strongest for someone who already owns M12 batteries and wants a dedicated fastener driver beside a drill.
The smaller platform does not eliminate reaction, noise, or bit breakage. Keep a stable stance and expect the tool to react when a fastener seats or binds. Use hearing and eye protection, keep your free hand away from the fastener path, and stop if the bit begins to cam out.
Drive modes are useful—but not a torque setting
Mode selection changes speed and impact behavior; it does not certify the finished joint to a torque specification. Start conservatively on small screws, brittle materials, and hardware near a finished surface. The dedicated self-tapping mode can help reduce overdriving after the screw breaks through metal, but the material, screw, and technique still control the result.
Use a torque-controlled procedure wherever the fastener has a published value. An impact driver can run a fastener down quickly, then the correct hand or calibrated torque tool should perform final tightening. This matters especially around wheels, engines, structural connections, electrical equipment, and manufacturer-specified assemblies.
Bits, adapters, and fasteners
Use impact-rated 1/4-inch hex bits in good condition and match the bit profile and size exactly to the fastener. Worn Phillips or Torx bits damage screws and increase slipping. A magnetic holder adds reach but also adds length and runout; insert short bits directly when access is the priority.
Hex-to-square adapters are convenient for light-duty nut driving, but every adapter creates another wear point. Do not use ordinary chrome hand-tool sockets with impact action. For repeated automotive work or larger nuts, buy the appropriate square-drive impact wrench and impact-rated sockets instead.
Battery strategy
All Milwaukee M12 batteries physically fit the platform, according to the manufacturer. Compact packs preserve the tool's short, light feel. Larger high-output packs can improve runtime and how the tool behaves under repeated demand, but they increase size below the grip. The right choice depends on whether access or sustained production matters more.
If you do not own M12 batteries, compare the complete cost of a battery and charger against a kit or an impact driver on your existing platform. A bare tool can look inexpensive until the power system is added.
Before ordering
Confirm bare-tool versus kit contents, seller, condition, return terms, and warranty eligibility. An Amazon offer is not by itself proof of authorized-dealer status. The Amazon page summary checked September 20 displayed a torque figure that did not match Milwaukee's official 1,500 inch-pound specification, so use the model number and manufacturer documentation—not marketplace copy alone—to verify what is being offered. Inspect the collet, housing, trigger, and battery contacts promptly after delivery. For a full-size alternative and a second tool in the same category, see the M18 FUEL 3697-22 combo-kit guide.
Sources checked September 20, 2026: Milwaukee's 3453-20 specifications and package and matching Amazon listing. Seller offers can change. No temporary price, purchase count, or ranking is used as a permanent recommendation claim.