Motion Pro Spark Plug Spanner incl 13/16" Socket (21mm)Designed to fit in limited space on many water cooled 2 stroke engines. Ratchet mechanism works one way, turn over to reverse Fits standard 13 16" plugs Kit includes Ratcheting Spark Plug Wrench (MP080147) and 13 16" Extension Socket (MP080291) 13 16" Extension Socket (MP080318) allows the MP080147 Ratcheting Spark Plug Wrench to be used on recent models where the water neck prevents the use of the MP080147 alone