The Hasler 335 envelope sealer is a proven workhorse designed for the user who needs high speed and production capability. It seals up to 175 #10 envelopes per minute and there is no postage meter required. It will handle envelopes up to 10" x 13" in size and up to 1/4" thick with a flap depth of 2 7/8". The Hasler 335 envelope sealer is a user friendly, reliable and extremely durable unit with a monthly duty cycle of 70,000.