48 Piece, 14 Grommet Kit, Contains Brass Grommets With Hole Cutter Hardwood Backer Block, Hardened Mandrel Anvil, Setting Tool Has Knurled Body For Greater Comfort Safety, Sizes Individually Marked On Setting Tool Coded With Lines On Anvil, Setting Tool Cutter Are Heat Treated For Long Life, Black Oxide Plating Prevents Rust