Morgan DT-1 Trimeezer - Trims 4 multi-sided discs or 4 round discs. Superior grinding-cleaning action on metal clean-up prior to using fillers. Discs run cooler and dissipate heat. Unmatched flexibility for sanding contoured surfaces. Perfectly balanced, safe to use. Shaped discs resist loading. Special Neoprene compound roller. Quick simple adjustment. Round sizes cut: 4-1/2", 5-1/2", 6-3/4", 8". To cut a custom diameter disc, replace blade spacers with 5/16" flat washers stacked in its place on either side of the blade. Strong-durable aluminum alloy die casting.