25/10 strong steel staples. Use with Leitz Heavy-duty 5552 stapler for optimum performance. Features: - For stapling up to 60 sheets (80 gsm) - Each box contains 1,000 staples - Premium quality, recommended for use with all stapler brands - 10 mm leg length - Up to 10 year guarantee on Leitz staplers when used with Leitz staples
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