1. Corrosion resistant steel.
2. Simple to use, accessing it to reach plugs without problem.
3. Dual-ended: 8/9mm, 10/11mm, 12/13mm, 14/15mm, 16/17mm, 18/19mm, 16.5/21.5mm(21/32'', 27/32''), 23/24.5mm(29/32'', 31/32''), 25.5/28mm(1-1/32'', 1-3/32''), 29.5/32.5mm(1-5/32'', 1-9/32''), 34/36.5mm(1-11/32'', 1-7/16''), and 1 x Tommy Bar.
4. Special tools for manual disassembly of the spark plug.
5. Mulfonctional, works perfectly to unscrew the nut.