attwood Boaters Key Like a tool box in your hand At just 3 1/2" high, it's amazing how much work the boater's key can do Made of high quality polished stainless steel. Eight tools for a thousand uses. Deck keys for fuel and water fills, garboard plug wrench 9/16" (standard size for most garboard and other plugs), shackle key 1/4" slotted screwdriver, hex head wrenches 5/16" and 7/16", bottle opener