Pack quantity: 48 Pcs, 12-each TPI 12 cs15TPI, Not tab, Regular Tooth - 12 Pcs15TPI, Regular Tooth - 12Pcs18TPI Regular Tooth - 12 Pcs24TPI Regular Tooth - 12 PcsMaterial : High Carbon SteelBlade Type: Scroll Saw BladesCompatible Material : Wood, Plastic and Thin Non-ferrous Metals (Copper, Zinc, Brass, Lead and Aluminum)These blades are designed for cutting wood, plastic and thin non-ferrous metals (copper, zinc, brass, lead and aluminum).These blades fit the new Dremel Moto-Saw MS20 or MS20-01 2 in 1 which uses pinned blades 4.13 inch (105 mm) total length, 3.94 inch (100 mm) between pins.Please note these blades do not fit the old Dremel Moto-Saw that uses 3 inch blades.The fine blades (similar to Dremel MS53-01) have 24 regular teeth per inch, 0.010 inch thickness and 0.074 inch width for extra smooth finish cutting, extra sharp turns, and for fine work.The medium blades (similar to Dremel MS52-01) have 18 regular teeth per inch, 0.010 inch thickness and 0.074 inch width for smooth finish cutting, and sharp turns.The coarse blades (similar to Dremel MS51-01) have 15 regular teeth per inch, 0.018 inch thickness and 0.094 inch width for fast smooth cutting, and medium turn