... and flowing line apperarance has made this mode of knife a very good appraisement for international market. Non-slip ... and work with great effciencyLong lasting , durable snap-off blade- a new sharp edge with each snapConvenient to change ... blade through loose and tighten the ratchet-lockApply to cutting paper, cardboard, roofing, drywall, vinyl, acetates, etc. Ratchet-Lock Utility Knife and blade ...