can these be used to level a flat surface on a very old concrete and pebble wall before bolting down fence pole supports.

They are more for cutting than grinding concrete/stone.

Can this cut through composite door reinforced steel frame? Need to fit the door with a gas pipe going through

I have cut through steel bolts with these discs so it should. However if the steel has been tempered in some way it may affect the cutting also the length of cut may need more than one blade, I've added this caveat as me usage has been on shortish lengths The issue for me when cuttiing somrematerial was that the body of the cutter stopped it cutting all the way through due to the thickness of the item.

does thi cutting disc fit bosch grinder

Just measure your existing disc, this disc comes with 2 adaptors. Good quality disc.

Will these cut through concrete fence post?

I used mine to cut breeze blocks which are very hard, they went through them like a hot knife through butter. Concrete fence posts are often reinforced with mild steel rods but these disks should have no problem dealing with them as I've used them to trim 8mm bolts. You will tell if you hit metal as sparks will fly otherwise it's just copious amounts of dust. Wear eye protection and gloves at all times.

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3 x 115mm 4.5" Diamond Disc Cutting Blade Angle Grinder Stone Brick Concrete

3 x 115mm 4.5" Diamond Disc Cutting Blade Angle Grinder Stone Brick Concrete

Product ID: 49100901

Details

Brand
Tech Traders
Compatible devices
Angle Grinder
Grit material
Diamond
Grit type
Fine
Product dimensions
11.4L x 11.4W

💎Segmented diamond grit for precision & durability

🔥Max 13,000 RPM for high-speed cutting

⚙️115mm (4.5") diameter fits standard grinders

Description

💎 Cut sharp, cut fast, never stop—upgrade your grind game!

BUILT TO LAST - Diamond segments engineered for extended durability and consistent performance.
TRIPLE PACK POWER - Three premium blades to keep your projects moving without pause.
UNIVERSAL FIT SPEED - Optimized for 115mm angle grinders running up to 13,000 RPM with zero wobble.
PRECISION EDGE CONTROL - Minimal vibration ensures clean, chip-free cuts every time.
VERSATILE CUTTING MASTERY - Effortlessly slice through stone, brick, concrete, and tiles—wet or dry.

The Tech Traders 3-pack of 115mm (4.5") segmented diamond cutting blades delivers professional-grade precision and durability for cutting stone, brick, concrete, and tiles. Compatible with standard angle grinders, these blades operate at up to 13,000 RPM and support both wet and dry cutting. Designed for minimal vibration and clean edges, this set offers unbeatable value and reliability for builders and DIY pros alike.

Specifications

ASIN	B06XFNK6HR
Best Sellers Rank	2,670 in DIY & Tools ( See Top 100 in DIY & Tools ) 4 in Diamond Blades
Brand	Tech Traders
Compatible Devices	Angle Grinder
Compatible Material	Concrete
Compatible devices	Angle Grinder
Construction Type	Super-Abrasive
Country Of Origin	China
Customer Reviews	4.5 out of 5 stars 3,090 Reviews
Global Trade Identification Number	00728350991396
Grit Material Type	Diamond
Grit Type	Fine
Grit material	Diamond
Grit type	Fine
Included Components	Tech Traders ® 3 x 115mm 4.5" Diamond Disc Cutting Blade Angle Grinder Stone Brick Concrete
Industry Standard Identifier	0728350991396
Item Diameter	4.5 Inches
Item Dimensions	11.5 x 0.2 x 0.1 centimetres
Item Dimensions L x W	11.4L x 11.4W centimetres
Item Thickness	1.9 Millimetres
Item Type Name	Diamond Disc Cutting Blade Angle Grinder Stone Brick Concrete
Item Weight	320 Grams
Item thickness	1.9 Millimetres
Manufacturer	Tech Traders
Manufacturer Part Number	Diamond-Disc-Cutting-Blade
Material	Concrete
Max Rotational Speed	13000 RPM
Model Number	Diamond-Disc-Cutting-Blade
Number of Items	3
Number of Packs	3
Product Warranty	No guarantee.
Product dimensions	11.4L x 11.4W centimetres
Recommended Uses For Product	Cutting, Grinding, Surface Preparation
Set Name	3 in 1
Special Features	Dry Or Wet Cutting for most building materials
UPC	728350991396
Unit Count	1.0 count

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