Power tool for forming a channel in a work surface and accessories therefor

A cutting element for forming a channel in a work surface comprising a body defining an opening for receiving a rotatable shaft, the cutting element having a substantially circular blade at an oblique angle relative to the shaft axis. Also disclosed is a power tool 10 incorporating the cutting blade. The blade in the power tool may comprise two cutting discs 320a, 320b set at oblique angles relative to the shaft axis, where the modulus of the angles of both discs are identical and adjustable but both slope in different directions relative to each other. The first cutting disc may be clamped between a first 330 and second 331 support section, and the second clamped between the second 331 and a third 332 hub. A second section 26 for engaging with a work surface such that the first section is moveable relative to the second section and can be moved into and out of engagement with the work surface. There may be a kit of parts comprising a plurality of support portions for mounting to a rotatable shaft of a power tool.