Will the larger of these be suitable for cutting fiberglass loft Insulation?

Depends on the thickness of the sheet. I believe it could cut through anything with thickness similar to the length of the cutter.

Are there any replacement blades sold for this? Which brand is best?

Yes ,you can buy replacement snap off blades,blades are pretty much the same from any maker,

Is there one knife in the pack or two?

Hi item 67677 is the small & large knife

Would this cut (cheap/average range) carpet?

If it is a very thin carpet yes. It won't cut through webbed backed carpets. Very thin and films blade

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Draper Redline 18mm Retractable Segment Blade Knife | Box Cutter | Snap-off Blade| Cutting Tool | Utility Knife | 67676

Draper Redline 18mm Retractable Segment Blade Knife | Box Cutter | Snap-off Blade| Cutting Tool | Utility Knife | 67676

Product ID: 145389101

Details

Blade length
1.8
Blade material
Metal
Brand
Draper
Colour
Blue
Handle material
Plastic
Item length
1.8

⚡quick blade replacement

🔪18mm snap-off blade

🛠️lightweight durable plastic handle

Description

🔪 Cut sharp, work smart — stay ahead with Draper Redline!

EFFORTLESS BLADE SWAP - Retractable segment design lets you refresh your blade in seconds—no downtime, no hassle.
LIGHTWEIGHT DURABILITY - Ergonomic plastic handle offers a comfortable grip without weighing you down during long projects.
PRECISION CUTTING POWER - Snap-off 18mm blade ensures razor-sharp edges for flawless cuts every time.
TRUSTED QUALITY HERITAGE - Backed by Draper’s century-long legacy of premium, reliable tools you can count on.
VERSATILE EVERYDAY UTILITY - Perfect for everything from packaging to detailed craftwork—your go-to cutting companion.

The Draper Redline 18mm Retractable Segment Blade Knife combines precision, durability, and ease of use in a lightweight, ergonomic design. Featuring a quick-snap blade replacement system and a sturdy plastic handle, this utility knife is engineered for professionals and DIYers who demand sharp, reliable cutting performance backed by Draper’s 100+ years of trusted craftsmanship.

Specifications

ASIN	B0144NEV26
Best Sellers Rank	127,758 in DIY & Tools ( See Top 100 in DIY & Tools ) 219 in Utility Knives (DIY & Tools)
Blade Length	1.8 Centimetres
Blade Material	Metal
Brand	Draper
Colour	Blue
Customer Reviews	4.6 4.6 out of 5 stars (497)
Global Trade Identification Number	05010559676767
Handle Material	Plastic
Handle Type	Manual-Retractable
Included Components	Draper Retractable Segment Blade Knife
Item Length	1.8 Centimetres
Item Type Name	1 x Draper 67676 Retractable Segment Blade Knife
Item Weight	20 Grams
Manufacturer	Draper REDLINE
Material	Plastic
Model Number	67676
Number of Packs	1
Part Number	67676
Product Style	67676

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