I have a tub surround to the ceiling that I would like to remove the grout. How long would you think it would take using this blade. Tiles are 3x3.

Not enough information. Is the surround a single piece that' s grouted at the tub, is it made of large tiles, is it made of small tiles...? This blade is very efficient, but the time is going to depend on how many linear feet of grout you have to remove.A more relevant question is how many feet of grout will the blade remove before it wears out. That answer is also dependent on your situation. Is the grout sanded or unsanded? How wide is the joint, 1/8" , 1/4" , wider? (This blade will not work on anything narrower than 1/8".) How old is the grout?Sanded grout will generally take longer and wear out the blade faster. Older grout is frequently harder than newer grout.And note that the blade is rounded, so if you need to get into corners you' ll need another kind of blade for that, something like a DEWALT DWA4242 Diamond Flush Cut Oscillating Blade.On average, I' d say that one blade will do the line between tub and surround before it wears out. At the price, get a second blade and swap out as soon as you notice your progress slowing. If you use the blade past its intended life, you may get overheating marks on a porcelain tub or damage to a Corean tub. Ditto for " don't push". If you push, the blade will wear out faster and you WILL get overheating.

It depends on the brick, but it should at least make a line of some depth in most brick, especially 'clay' brick. If you need to cut refractory or porcelain coated,or just plain porcelain brick, it ought to work, but an ablating abrasive wheel would be a better choice, note that either will put out a goodly cloud of dust but the wheel will put out more and finer dust. Use a mask and cross ventilation for either process. A diamond blade will likely be a better choice, last a bit longer and cut more cleanly. Same warning about the dust!

Will this cut into concrete ? If so, what depth ?

No, this blade is recommended for grout removal.

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⚡ Cut grout like a pro—no adapters, no hassle, just results.

BUILT TO LAST - Crafted from robust alloy steel for industrial-grade durability and long-lasting performance.
ERGONOMIC DESIGN - Optimized blade shape ensures smooth operation and reduced vibration for professional results.
READY WHEN YOU ARE - Lightweight and easy to handle, perfect for quick job site swaps and on-the-go productivity.
SEAMLESS COMPATIBILITY - Fits all major oscillating tools without adapters—plug and play efficiency.
PRECISION CARBIDE CUTTING - Engineered carbide edges deliver fast, clean grout removal with minimal effort.

The DEWALT DWA4220 Oscillating Fast Cut Carbide Grout Removal Blade is a universal-fit, adapter-free accessory designed for all major oscillating tools. Featuring durable carbide edges and alloy steel construction, it delivers fast, precise grout removal with industrial-grade reliability, making it an essential upgrade for professionals seeking efficiency and longevity in their toolkit.

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Manufacturer	Dewalt
Part number	DWA4220
Item Weight	0.28 g
Product Dimensions	12.22 x 2.16 x 14.61 cm; 0.28 g
Is Discontinued By Manufacturer	No
Size	One Size
Color	mulch
Style	Industrial
Finish	Frosted
Material	Alloy Steel
Pattern	Solid
Item Shape	Rectangle
Number Of Pieces	1
Included Components	Dewalt - DWA4220
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	12.2 x 2.2 x 14.6 cm

DEWALT Dwa4220 Oscillating Fast Cut Carbide Grout Removal Blade

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