Renz punching dies to fit the DTP-340M, the dies are easy to change and takes less than one minute.
The punch dies are high quality heavy duty construction.
Dies are available for most loose leaf binding including wire, plastic comb, spiral, calendar and two/four hole.
The spiral die has 5mm x 4mm oval holes, and is 4:1 (0.2475) pitch.
The below video shows some helpful tips on changing the dies...
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Chilvers Reprographics have been supplying Print Finishing Equipment for almost 60 years