Sha: Disc perforated for best special refrigeration for hard materials, klinker, reinforced concrete, washed concrete, brick, terrazzo and iron. Excellent for general work. SHA: Perforated Disc For Better Cooling, Specially For Hard Materials, Klinker, Reinforced Concrete, Washed Concrete, Brick, Terrazzo and Iron. Excellent for General Work. SHA; Très Performant Sur Les Matériaux Dure Pour ça Qualité de refroidissement, Carrelage Béton Armé, Béton Washed, Brices, Fer. Excellent Réultat Dans Les Chantier in Général