MulWark Heavy Duty Zinc-Alloy SK4 Snap-Off Easy Loading Retractable Razor Utility Knife Multi Box Cutter for Carpet, Rope, Cardboard,Drywall-15 Sharp Rust-Proof Blades Included with Metal Safety Lock;

MulWark Professional Grade Auto Reloading Stainless Steel Bulk Ratchet Large Snap Box Cutter Knife

The One Tool You Should Never Be Without!

Heavy Duty Snap-off Disposable Blade

This set comes with 5 shatterproof stainless steel blades that feature triple ground cutting edge, 50% sharper than normal ones and can stay sharp 3x longer. They do not flex and surely outlast traditional carbon utility knife blades. Cutting solidly, efficiently and safely, the retractable and replaceable blades make sure that you are always working with the sharpest edge.

Ergonomically Constructed Handle

The full-size contoured TPR handle fits your hands much better than other cheaper brand utility knifes. It's strong, ergonomic curved ribbing provides an accurate, comfortable, balanced controlled sure grip, and prevents slipping both when bearing down with forefinger and also when pulling back to cut

Double Secure Swivel Lock

It can lock the blades inside when not in use, avoiding the blades' accidentally getting out. You can also use it to lock the blade while using to ensure the blade stays strong and stable; it has a great, positive locking force (can endure up to 40KG impact) to prevent blade slipping on hard-to-cut materials.

Objects/Materials
that have been tested on with this MulWark manual retracting utility knife includes:

Cardboard, rubber, carpet, leather, wood(carving & trimming), rope, fabric, drywall, wallpaper, cork board, acetates, linoleum, carpet tile, thin veneer, EVA foam board/ floor mats, drywall( also known as plasterboard, wallboard, gypsum panel, sheetrock, or gypsum board), insulation board, vinyl tile, wallboard, cement backerboard, fiberglass, wire sheath, tapes in general, etc.