Stanley Interlock Knife RWS026, This is the well known Stanley brand  of knife, which due to the way it locks up the blade makes this knife suitable for a carpet fitters who dislike the Dolphine style of  knife. It will take all the standard pattern blades and has a rear lock wheel which forces the two sections of handle together to hold the blade safe while you cut carpets or other floor materials. As this knife has no case care must be taken with the fixed exposed blade.