Joint grooving : Means making a groove along a joint between two floor coverings glued side by side. 2 types : Tight joint (less than 1 mm) for PVC flooring without foam and linoleum (Tarkett, Forbo) Wide joint (more than 1 mm) for foam-backed PVC acoustic and sports flooring (Gerflor) Homogeneous floors Heterogeneous vinyl floors Heterogeneous cushion vinyl Compact Vinyl Foam For making a "U" groove without a ruler, in a regular, uniform and rapid way. Mounted on 4 outer caster wheels and 2 guiding wheels (one at the front and one at the back). Blade depth adjustment button. Grooves up to the skirting.