Auto-retractable safety utility knife Certification:TUV GS Material:zinc alloy,TPR/TPE rubber Auto- ... TPR/TPE rubber zinc alloy super safety utility knife,zinc alloy safety utility knife,Auto-retractable safety utility knife*Certification:TUV,GS*Material:zinc alloy,TPR ... handed4>. Safety design,suitable for opening box and carton etc.5>. even if slider is still at extending position,blade retracts ...