Cutting devices

A hand-held, portable cutting device for cutting a substrate, comprising:

• an elongate body including a handle portion defining an opening through which a user's fingers pass during use of the cutting device;
• at least first and second rotatable cutting blades arranged on said body, said first and second cutting blades each being arranged to rotate about a respective rotational axis, said first cutting blade being movable, while in engagement with said body, in a longitudinal direction of said body and relative to said second cutting blade to thereby vary a longitudinal spacing between the rotational axes of said first and second cutting blades;
• a third rotatable cutting blade mounted on said body;
• and
• first mounting means for mounting said first and third cutting blades to be movable in the longitudinal direction of said body, said first mounting means comprising a longitudinally extending slot formed in said body and a pair of sliding members slidable in the longitudinal direction in said slot, said first and third cutting blades each being mounted to a respective one of said sliding members,
• said first, second and third cutting blades having a cutting edge arranged on the same side of said body relative to said opening such that when said body is placed against the substrate, all of said first, second and third cutting blades can engage with the same side of the substrate and upon application of manual pressure to said body, said first, second and third cutting blades cut the substrate from the same side;
• and a respective locking screw arranged to engage with said body and each of said sliding members to thereby lock said sliding member in any one of a plurality of different longitudinal positions relative to said body.