Are the blades sharp?

Not sure about what you consider as sharp, but i used it to cut some cat 5e cable. I cut off as little as about 1 mm to even each wire prioir to inserting into the cat 5e connector. it worked great

Are they rated for cutting acsr?

Yes any other type the stripping holes are designed for American size cable but being in uk I gave used them on 1.5, 2.5, 4.0 mm cable with ease

These don't have a spring. still better than similar milwaukee #48-22-3078? https://www.amazon.com/milwaukee-electric-tool-48-22-3079-combination/dp/

Both are very handy when needed for both assembly line and electrical work but I love Klein cause they are worth the money spent and Milwaukee 6 and 7 in 1 pliers and 48-22-6579 combo strippers as well.

ASIN	B08BX9RTPX
Best Sellers Rank	524,335 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,354 in Wire Strippers
Brand	KLEIN TOOLS
Colour	Multi
Customer Reviews	4.6 out of 5 stars 1,042 Reviews
Global Trade Identification Number	00092644340277
Grip Type	Ergonomic
Grip type	Ergonomic
Handle Material	Plastic
Handle material	Plastic
Included Components	Wire stripper
Item Type Name	Multi-Tool Wire Strippers
Manufacturer	Klein Tools
Material	Alloy Steel
Model Number	K12065CR
Part Number	K12065CR
Set Name	No Set
Specification Met	ISO 9001
Specification met	ISO 9001
UPC	092644340277
Unit Count	1.0 count
Usage	Professional

Klein Tools K12065CR Wire Stripper/Cutter/Crimper Tool for Cutting, Stripping, Crimping, Twisting (8-18 AWG Solid, 10-20 AWG Stranded)

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