Model 1632 Automatic Electric Letter OpenerAutomatically feeds, opens and collects a 1 3/4" tall stack of standard size business envelopes up to 7,000 per hour. Hands-free operation, place envelopes in position and turn machine on. Blades are fully enclosed to protect fingers. Nonskid feet. Ideal for mid-size to large businesses and mailrooms. All new letter catch tray included. Blade Type: Concealed; Blade Material: Steel.