This is a 2-pack of Course Tooth Blades that are 1-3/4-Inch wide blades for fast plunge cuts and flush cuts in wood, plastic, drywall and other soft materials up to 2-1/4-Inch deep. They are constructed of High-Carbon-Steel for increased durability and strength. The GAMT517-2 Coarse Tooth Black Pack Universal Accessory fits almost All Oscillating Tools on the Market, most with NO Adaptor Needed and is an excellent accessory for our popular Genesis GMT15A, GMT16V and GMT25T Oscillating Tools.