Bosch T345x F3-Piece 4-1/2 In. 8-12 TPI Progressor for Wood T-Shank Jig Saw Blades Progressor tooth design provides superior performance in speed and cleanliness of cut Ideal for fast and clean cuts through thick and thin wood Ground teeth for superior speed and cleanliness and taper ground backing for increased blade life Tip engineered for easy plunge cuts High carbon steel construction for long life in wood Wood blades feature a super sharp plunger tip for fast, precise plunge cuts Developed specifically for composite materials Teeth milled and set 4-inch length