The Stanley contractor grade swivel-lock retractable utility knife starts sharper and stay sharper than standard heavy-duty blades. This knife features an interlocking nose to secure the blade safely between knife halves. The large, 7 In. handle is comfortable for extended use and swivels open for quick easy blade change. Three blades are includes in the handle. With an aluminum body for maximum durability, this utility knife comes with Stanley's limited lifetime warranty.