ITEM NAME:20pcs/Set HSS Routing Wood Rotary Milling Rotary File Cutter A#S Product Description Description: Item specifics Size: 20pcs 3mm shank DIY Supplies: Woodworking Model Number: 20pcs Burr Bit Grinder Type: Other Type 1: Free.Type 8: Rotary Burr Rotary Rasp. Type 3: Woodworking End Milling Cutter. Type 5: HSS Rotary Files Set. Size: 20pcs 3mm shank. Model Number: 20pcs Burr Bit Grinder. These 20 HSS Routing Bits are perfect for all sorts off jobs like Model making and the like.