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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Description

💎 Cut sharp, cut fast, cut like a pro with Tech Traders!

SPEED DEMON - Handles up to 13,000 RPM for ultra-efficient grinding and cutting
ALL WEATHER READY - Dry or wet cutting options keep you working in any conditions
TRIPLE PACK POWER - Get 3 premium blades in one set—never run out mid-project
COMPACT LIGHTWEIGHT - 115mm diameter and just 310g for easy handling and less fatigue
PRECISION CUTTING EDGE - Segmented diamond design ensures clean, fast cuts on stone, brick, and concrete

The Tech Traders 3-pack 115mm (4.5") diamond disc cutting blades are engineered for high-performance angle grinders, delivering precision segmented diamond edges that cut through stone, brick, and concrete with ease. Rated for up to 13,000 RPM and suitable for both dry and wet cutting, these lightweight, durable blades ensure professional-grade results on every job.

Specifications

Manufacturer	Tech Traders
Part Number	Diamond-Disc-Cutting-Blade
Product Dimensions	11.43 x 11.43 x 11.43 cm; 310 g
Item model number	Diamond-Disc-Cutting-Blade
Size	115 mm, 4.5-Inch
Colour	Gold
Style	Industrial
Material	Concrete
Shape	Circular
Thickness	0.8 Millimetres
Power Source	Hand Powered
Item Package Quantity	1
Number of Pieces	3
Measurement System	Metric
Grit Description	Fine
Special Features	Dry Or Wet Cutting for most building materials
Included Components	Tech Traders ® 3 x 115mm 4.5" Diamond Disc Cutting Blade Angle Grinder Stone Brick Concrete
Batteries included?	No
Batteries Required?	No
Item Weight	310 g

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