This trowel has a projecting groove along its base which is upturned at one end for dividing fresh concrete slabs into equal parts to control cracking.Wood handle.Double hang.Carbon steel blade.Blade Size 150 x 75mm (6 x 3 in) , with a 12mm (1/2 in) radius edge. Groover Trowel 6 x 3 x 1/2in