4 Dozen Olson Mach Speed Scroll Saw Blades Variety Intro Pack 3R, 5R, 7R, 9R (Four Dozen Blades) Olson Mach Speed Blades One Dozen of Each Size 3R, 5R, 7R, 9R, 5" long blades with plain ends (unpinned) Precision milled teeth to cut through hard and soft woods Diagonally cut ends allow easy feed through starter holes and make installation a snap less