Pick the wrong diamond blade and you'll chip porcelain, cloud a glass edge, or burn through a $60 blade in an afternoon. RUBI builds a dedicated blade for every material and every saw โ here's how to choose the right one the first time.
RUBI's diamond blade lineup, at a glance
Each RUBI blade is engineered for a specific cut. These are the ones professional tile setters reach for most:
- RED COBRA PREMIUM (Wet) โ the all-rounder for porcelain and ceramic on a wet saw.
- RED COBRA PREMIUM 4ยฝ" (Dry) โ the same cutting power for an angle grinder, no water needed.
- GLASS PREMIUM (Wet) โ a continuous rim for chip-free glass tile and delicate mosaics.
- BLADE BADGER 4ยฝ" โ a mesh turbo blade for fast cutting wet or dry.
- BLADE ECD 2-in-1 4ยฝ" โ cut the tile and grind the edge with a single blade.
- 5" Cutting & Grinding Blade โ for shaping and edge work on larger pieces.
Wet or dry: match the blade to your saw
The first decision is simple. If you run a tile saw with a water reservoir or pump, use a wet blade โ the water cools the diamonds, controls dust, and gives the cleanest edge on porcelain and stone. If you're cutting on an angle grinder for notches, holes and on-the-wall trims, reach for a dry blade like the RED COBRA Dry or the Badger. The Badger and ECD are rated for both, which makes them handy backups in the truck.
Choosing a RUBI blade by material
Porcelain and dense ceramic
Hard, glassy porcelain is what chips most blades. The RED COBRA PREMIUM uses a laser-welded turbo rim that stays sharp through large-format porcelain without rounding the edge โ the safest pick for daily porcelain work.
Glass tile and mosaics
Glass needs a continuous (non-segmented) rim so it doesn't grab and shatter. The GLASS PREMIUM is built exactly for that โ run it wet and slow for a polished, chip-free edge on glass and glass mosaics.
Natural stone, marble and granite
Stone is abrasive and loves to overheat. A wet cut with the RED COBRA keeps temperatures down and protects the diamonds; for shaping a bullnose or eased edge afterward, the 5" Cutting & Grinding blade does double duty.
Pro tip: a sharp blade is a cheap blade
If your blade starts glazing or cutting slow, it isn't dead โ it's dull. Make a few passes through a dressing stone (or an old piece of fast-firing brick) to expose fresh diamonds. One minute of dressing can add weeks of life and saves you buying a replacement early.
Frequently asked questions
Can I run a wet blade dry?
Only briefly. A wet-rated blade can overheat and warp without water. If you need to cut dry regularly, choose a dry-rated blade like the RED COBRA Dry or the Badger.
What RUBI blade cuts porcelain without chipping?
The RED COBRA PREMIUM (wet) is the go-to for chip-free porcelain. Cut from the back, keep the water flowing, and don't rush the last inch.
How long should a RUBI diamond blade last?
With water and regular dressing, a premium RUBI blade will cut hundreds of linear feet of porcelain. Cutting dry, forcing the feed, or starving it of water are what kill blades early.
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