many times, bleed nipples are mostly the same size, you will want some soft clear hose/tube. about 2.3mm inside diameter, should be stretchy,
if you go to halfords you used to be able to buy a bleed kit which comes with some hose and has a special valve to help the process.
Remember if your caliper has two bleed nipples always do the inner one first.this is very important. as air can get trapped if only one half is bled, or the ouiter is done first.