OVERVIEW. Product Overview. Shark Colflex Grinding Discs. Quality German grinding discs available in 115mm, 125mm, 180mm & 230mm. Shark Grinding Disc . General-purpose grinding and finishing of steel, stainless steel, etc. Quality German Discs. Fast grinding with the ability to remove material with less pressure. Ideal for stainless steel & carbon steels. Two reinforced nets provide maximum safety and unsurpassed performance. Replaced by PFERD and TAILIN