25 Blade Long Feeler Gauge Set, 0.0015 in to 0.040 in Thickness, Inch Metric, 1 2 in x 12 in no checkout Power Blast Technology™ is a Power Blast Technology™ is a high speed blasting along the cutting edge that strengthens the blade to reduce breaks and increase durability Patented T2™ Technology reduces cutting forces on each tooth and optimizes chip removal to allow efficient cutting in the widest range of materials Patented metal cutting TPIs provide faster and more efficient cutting in the widest widest variety of materials Ideal for sharpening straight blades and gouges Blades etched with both decimal size and metric equivalent Easily measures gap widths Durable flexible steel construction