Ryobi ZRBS904G 2.5 Amp 9 in. Portable Band Saw (Green) (Certified Refurbished) Upper and lower blade guides help keep the blade from twisting during operation Blade guide adjustment knob adjusts the blade guide assembly up and down to keep the blade from twisting or breaking A blade guard protects you from coming in contact with the blade during operation Dust exhaust port makes dustless cutting possible by attaching a dust bag or shop vacuum to the dust exhaust port Easy open latches allow front cover to be opened for making adjustments