Usual practice is to twist the ends and cut them off in the twist,
leaving about 1/2" twisted. Normally it's soft stainless steel (don't
know the alloy), but if corrosion isn't a concern I don't see why you
couldn't use ordinary steel 'baling' wire of the proper diameter.
Copper or aluminum are definite no-nos. If you live in the US, Harbor
Freight seems to carry a 1 lb spool of .041" SS lock wire for about $8.
They also carry the funky twisting pliers for about $15, which I think
are worth the price even for just a few twists.
> Could someone advise me of the proper way to tie the ends of the wire
> when safety wiring two bolts . Also is a special type wire used ?