Power through moulding and trim with the FLEX FX4321-1A 16Ga Straight Nailer Kit. This cordless finish nailer is built for pros and serious DIYers who want fast, reliable nailing without crawling to a power outlet. The kit includes a 2.5Ah battery and a 160W charger for all-day work sessions.

Key Features & Design

• High-speed, brushless performance: The FLEX 24V Brushless 16Ga Straight Finish Nailer drives up to 3 nails per second with zero ramp up time.
• Extended runtime: Drives up to 1,500 nails on a single charge with a 2.5Ah lithium-ion battery.
• Depth control at your fingertips: Ergonomic quick depth adjustment lever easily sets the ideal nailing depth.
• Brightwork helper: Triple LED light delivers shadow-free illumination for dark work areas.
• Versatile firing modes: Toggle between bump and sequential firing modes.
• Job-site visibility: Nail indicator shows how many nails remain in the magazine.
• Safety first: Dry-fire lockout prevents blank firing and protects your work when nails run out.
• Clear jams fast: Tool-free jam clearance lets you clear jams quickly without tools.
• Portable and comfortable: Compact, lightweight design with a heavy-duty belt clip mountable on either side.
• Spec-ready: Accepts 3/4-inch to 2-1/2-inch 16-gauge fasteners.
• FLEX 24V cross-compatibility: Works with all FLEX 24V batteries, chargers, and tools.
• Warranty: FLEX Limited Lifetime Warranty - Register your new FLEX tool, battery, or charger within 30 days of purchase through December 31, 2024 to receive a limited lifetime warranty.
• Kit contents: Includes (1) 16Ga Straight Nailer [FX4321], (1) 24V 2.5Ah Lithium-Ion Battery [FX0111], (1) 24V 160W Fast Charger [FX0411], (1) Belt Clip, (3) No-mar Tip, (1) Soft Bag.

The FLEX Advantage

THE FLEX ADVANTAGE - 20% more power with 24V lithium, 25% longer runtime with THERMA-TECH™ heat management, up to 50% faster charging with high-power, dual fan chargers

Whether you’re finishing trim, applying moulding, or tackling tight spaces, this cordless nailer blends power, runtime, and practical design. The compact build, ergonomic depth control, and shadow-free lighting keep you moving with confidence. And if you love a good throughput, the jump from ramp-up to nail-on is instantaneous—no slow start, just steady progress. Ready to upgrade your toolbox and your finish work?