Imperial Blades MM133 – 1 1/4 Inch fine tooth universal oscillating plunge blade. The thinnest blade we make is designed for wood and soft plastics. This induction heat-treated high carbon steel blade is specifically designed for precision wood applications. Popular uses for this blade: Cutting under the kick plate when installing new flooring, undercutting door jams, flush cutting tongue-and-groove wood. 16 TPI (Teeth per inch). Blade dimensions: 1 1/4 inch wide x 2 5/8 inch plunge depth.