You don't see many snap-blade knives on job sites – but maybe you should, because their blades can be quickly renewed by breaking off the tip and advancing a fresh new edge. Tajima's Driver Cutter knife has a thicker-than-normal metal blade sleeve and a molded rubber grip with space for several spare blades inside. When the blade is retracted, the hardened tip of the sleeve can be used in place of a flat-head screwdriver for opening paint cans and turning the occasional screw. The knife comes in two models: Auto Lock and Dial Lock.
Price: about $8. www.tajimatool.com.