Every flooring installer knows this: a good knife and the right blade can save hours on a job, while the wrong choice can slow you down, damage materials, or simply wear you out. Whether you’re cutting carpet, trimming LVT, shaping vinyl, or working on detail finishes, choosing the right combination of knife and blade really matters.
This guide is written for flooring professionals, based on the most popular and trusted products available on Flooring Tools Direct. We’ll break things down by flooring type, explain which knives and blades work best, and highlight brands installers consistently rely on—Roberts, Floorfit, Sweeney Todd, Wolff, and Janser.
Why the Knife and Blade Choice Matters on Site
Different flooring materials behave very differently under the blade. Carpet needs strong hook blades that pull through fibres cleanly. LVT and vinyl need sharp, controlled straight cuts to avoid tearing or dragging. Trimming edges and details requires precision and comfort, especially during long days.
Using the correct blade:
- Improves cut quality and finish
- Reduces strain on your hands and wrists
- Minimises blade changes and breakages
- Speeds up installation time
Flooring Knives Installers Trust
Dolphin Knives – A Trade Favourite
Dolphin knives, also called Delphin Knives, are among the most popular choices for professional installers—and for good reason. They’re lightweight, well-balanced, and designed for fast blade changes. On Flooring Tools Direct, installers regularly choose:
- Dolphin Knife – Used for most flooring installations, as well as any other construction works.
- Dolphin Knife 2000 – A solid all-rounder for vinyl, LVT, and general trimming
- Dolphin Knife Black / Blue – Simple, durable, and comfortable for daily use
- Janser Dolphin Knives (Forest Green, Hi-Vis Yellow, Racing Red, Sky Blue) – Same trusted design with high visibility and colour options for busy sites
These knives are ideal when you’re making repeated straight cuts and need speed without sacrificing control.
Harlequin & Trimming Knives
For installers who want something a little heavier in the hand, Janser Harlequin knives are a popular option. They offer excellent grip and stability, especially useful when cutting thicker materials or trimming tougher edges. You’ll also find Roberts Pro Utility Knives and Stanley Titan / Retractable Knives on the site, which many installers keep as backup or site knives for rougher work.
Choosing the Right Blade by Flooring Type
Carpet Flooring – Hook Blades Are Essential
When cutting carpet, straight blades simply won’t do the job efficiently. You need hook blades that pull through fibres cleanly without snagging.
Most popular carpet blades include:
These blades are ideal for:
- Broadloom carpet
- Carpet tiles
- Trimming edges and seams
LVT & Vinyl Flooring – Straight and Concave Blades
LVT and vinyl require clean, precise cuts. Dull or aggressive blades can tear the surface or leave visible marks.
Recommended blade types:
These blades pair perfectly with Dolphin knives and are a staple in any LVT installer’s tool bag.
Trimming, Detail Work & Repairs
For edge trimming, corner work, and repairs, precision matters more than speed.
Many installers keep a separate knife set aside just for detail work to maintain blade sharpness.
Blade Storage and Safety on Site
Blades are only effective when stored and handled properly. Flooring Tools Direct stocks a range of blade dispensers and storage boxes, including:
- Irwin blade dispensers
- Stanley blade packs
- Sweeney Todd blade boxes
Using proper storage reduces injury risk and keeps blades sharp for longer. You may also buy the blades in plastic boxes to keep them safe while working on site.
Recommendations for the flooring trades
- Change blades more often than you think—a sharp blade is safer and faster
- Keep separate knives for carpet and vinyl to avoid cross-damage
- Always carry both hook and straight blades on site
- Choose heavy-duty blades for commercial work and standard blades for domestic installs
There’s no single “best” knife or blade—only the right tool for the job. By matching the correct knife and blade to the flooring material you’re working with, you’ll cut cleaner, work faster, and reduce fatigue on long installs. At Flooring Tools Direct, you’ll find all the trusted brands installers rely on—Roberts, Floorfit, Sweeney Todd, Wolff, Dolphin, Janser, Crain, Stanley, and more—all in one place.
If you’re reviewing your kit or stocking up for the season ahead, this is the perfect time to make sure your knives and blades are working for you, not against you.
