The 70LETT 3033 DocuGem 70LETT-LO3033 Mid-Volume Flats Opener saves time and money. The DocuGem LO 3033 is made of heavy duty solid metal construction throughout. With an automatic envelope feed this makes it reliable throughput. The feeder handles all envelope sizes up to 1/2" thick. Has speeds of up to 1200 envelopes like cardboard, USPS Priority/Express flats, and big padded envelopes.automatically per hour with no sorting. This Industrial strength letter opener is simple and with a reliable high degree of operational reliability this machine is not only user friendly but easy to operate.