Tool Kits/Spare Parts

I've been slowly building my boat kit and thought I would start a post to see what other things you all keep as spares/parts. Here are a few of the things I currently have:

Perfect Pass cable
Impellor
Plug
Hoses
Hose Fittings
Nuts, bolts, washers
Various electrical parts
Duct Tape
Electrical Tape
Pipe Tape
Vice Grips
Needle Nose Pliers
Rachets
Screw Driver Kit
Wire Snips
Allen Wrenches
Twine
Oil

Any other things that you have all learned from experience that should be a must in anyone's tool kits??