Blades housed in strong but comfortable plastic handles. Both types include a detachable device for safely snapping off blade segments.
Stanley 10-143P 18MM Quick-Point™ Snap-Off Retractable Utility Knife
DOWELL Utility Knife Box Cutter Retractable Self Loading Heavy
Saxton 18mm Retractable Utility Snap off Blade Knife Aluminium Alloy
Stanley® Quick-Change Utility Knife with Twine Cutter and (3
B8R06686 - Stanley Snap-Off Blade Knife
Stanley (10-099) CLASSIC 99 RETRACTABLE UTILITY KNIFE
Stanley STHT10479-0 Retractable Blade Utility Knife –
Stanley Knife Snap-Off Blade 9mm 0-10-150
Stanley Safety Knife with Snap-off Blade, Retractable