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Quantity: include 20 x diamond cutting disc, 4 x mandrel and 2 x crystal screwdriver Design purpose: designed for Dremel rotary tools, turn your rotary tool into cut-off saw and grinding machine Product size: cutting discs diameter: 22 mm; Thickness: 0.6 mm; Mandrel diameter: 3.0 mm; Cross screwdriver length: 98 mm Wide application: the cutting wheels are sturdy and strong, making them fit for cutting gemstone, glass, ceramics, porcelain, tiles, carbide, rocks, aluminium and copper Attention: for your safety, please must wear gloves and goggles and be care around spark when using mandrel diamond cutting tools; It may become very hot when cutting, add some water to keep it cool