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A utility knife is useful because it puts a sharp edge exactly where you need it. That same concentrated edge makes careless cutting unforgiving. The safest routine begins with a supported workpiece, a clear cutting path, and a blade extended only as far as the task requires.

Use the knife for materials and cuts it is designed to handle. It is not a pry bar, screwdriver, or substitute for a saw when the material needs a different tool.

Inspect the knife before opening it

Check that the blade locks securely and the handle is intact. A loose blade or unreliable retracting mechanism should be repaired as directed or the knife replaced. Do not improvise a fix with tape around a damaged housing.

Use the correct replacement blade for the model. Follow the knife's opening and blade-change instructions, keeping fingers away from the cutting edges. Store spare and used blades in suitable protective containers.

A dull blade often encourages extra pressure and repeated slips. Replace it when cutting becomes rough or requires more force than usual, rather than waiting for it to fail completely.

Support the material and plan the exit

Place the work on a stable cutting surface that protects what lies beneath. Keep your free hand outside the entire possible blade path, including where the knife would travel if it slipped.

For straight cuts, use a suitable straightedge with a safe gripping area. A thin ruler can expose fingers close to the edge. Hold or secure the guide so it cannot move midway through the cut.

Cut away from your body and maintain a stance that stays balanced if the material suddenly gives way. Do not cut while holding the work against your leg or in your palm.

Open cardboard without damaging the contents

Extend only enough blade to cut the tape or cardboard layer needed. A deep cut through a box can damage the item inside or strike hidden staples. Inspect the seams and choose the shallowest practical path.

For breaking down empty boxes, use controlled cuts on a supported surface. Flatten the cardboard only when doing so does not bring your hand into the cutting line.

Heavy or reinforced packaging may need another tool. If the blade binds, stop applying force and keep the material supported. Free or retract the blade only by the knife maker's safe procedure; do not twist, yank, or force a jammed mechanism. Reposition the work only once the exposed edge is controlled.

Remove caulk with particular care

A blade can score old caulk along a joint, but it can also scratch acrylic, cut waterproofing, or damage a nearby finish. Use a suitable plastic removal tool when it can do the job with less risk.

Keep any blade work shallow and directed away from the fixture surface. Check the fixture manufacturer's approved removal methods, especially around delicate materials.

Do not use the knife to dig blindly into a gap. You need to know what lies beneath the old sealant before deciding how much cutting is appropriate.

Finish each cut before changing position

Retract or cover the blade before walking, reaching for supplies, or setting the knife down. Place it where it cannot roll off the work surface. Never hand someone an exposed blade.

For snap-off designs, use the intended snapping tool or cap and follow the instructions while protecting your eyes. Do not break segments with bare fingers or scatter them into ordinary loose trash.

Collect offcuts and used blades in a puncture-resistant disposal container appropriate to local rules. Clean the handle and check its mechanism before storage. A utility knife stays convenient when every movement around the exposed edge is deliberate, including the moment after the cut is finished.