3Pcs HSS drill bit set . 3Pcs HSS drill bit set, great tool for jobs of all sizes. It's ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic,copper, fiber, glass and PVC etc. Specifiion: The 3 Cutters Come in the Following Sizes with Increments of 2mm: Large Drill;4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, .