The ones I bought are from RDG Tools and cost £139.50 inc p&p, I think you can find a little cheaper if you hunt around, but I liked the fact I know where they are and I could use the pick up at an Argos store, Ordered Wednesday picked up Friday.
It says up to 2.5 mm,????? probably on a small strip, but look at the others and assume all the same so take note of the gauge of metal with the rest and assume the same.
No instructions come with it so read up on line and see what you can find.
