This knife has a multi-purpose steel blade that can be used for tucking carpet near fragile tiles or toilets, a hook edge for heavy cutting, a front scraper edge with a notch for removing door pins, and a flat head screwdriver for Crain scraper screws. The other end has a steel tapping insert.
 
Five Tools in One!
Tuck, Cut, Scrape, Remove Door Pins & Screws
Steel Tapping Insert on Handle
Uses No. 177 Replacement Blades