10Pcs Universal Knife Blades

A universal blade is short, thick and trapezoidal, and it is held rigidly in the head of the knife rather than sliding in a flute. That rigidity is the whole point. Where a snap-off blade is long and thin and will flex or snap under heavy pressure, a universal blade does not move at all, which is what lets you lean into a cut through carpet, roofing felt, thick card, leather, canvas or insulation board without the blade wandering off your line.

They are SK5 — a Japanese high carbon tool steel at roughly 0.8 to 0.9 percent carbon, hardened and tempered. That carbon content lets the blade be taken to a high hardness, and hardness is what gives a keen edge and keeps it keen. The difference shows in how long the blade cuts cleanly before it starts tearing, and a blade that has started tearing is one people press harder on, which is exactly how hands get cut.

Each blade has two usable ends: when one end dulls, reverse it in the knife and you have a fresh edge. Ten per plastic box.

The box is worth having rather than loose blades. Reaching into a toolbox where loose blades are lying is a genuine way to get cut, and a closed box also keeps them dry — high carbon steel spots with rust in a humid store, and a rusted edge is a dull edge.

The buyers are carpet and flooring fitters, roofing and insulation contractors, upholsterers and canvas workers, packing and dispatch departments, shopfitters, leather workers, and hardware dealers supplying trades that cut heavy material.

Three habits. Change the blade as soon as it stops cutting cleanly rather than pressing harder — a dull blade skids off the material and goes wherever you were pushing, which is the mechanism behind most knife injuries. Cut away from your body and never towards your supporting hand. And dispose of used blades in a tin or a taped container rather than loose in a bin, because loose blades cut the people who empty it. Ask us on WhatsApp for a price.