The Sheffield 12131 quick change Lock Back utility knife offers Sheffield bestinclass Lock Back utility line in a camouflaged model The knife’s patented quick change function makes for a smooth blade replacement while allowing for easy cleaning of the blade holder should any gunk get in there An oversized thumb rest allows for extra pressure to be exerted in controlling the cut, while our Lock Back release mechanism both holds the knife open securely while allowing for easy folding This knife accepts all standard utility blades, but you not need one again for awhile considering the quick change Lock Back utility knife’s inclusion of six blades, where one in the blade holder already and five stowed in its blade storage compartment As always, Sheffield industry leading lifetime warranty backs you up