CRAFTSMAN Carpet Knife 3/4-in 1-Blade Retractable Utility Knife in the Utility Knives department at, Carpet Knife - valleyresorts.co.uk
Dolphin Knife - NeoGrass
BFG Carpet Knife Cutter - 45mm Diameter Blade, Disc Cutter with Hand and Surface Protection, Durable ABS Handle, Great for Sizing Carpet, Linoleum, Other Floor Covering, and Cutting Cardboard : Amazon.co.uk: DIY