1. efficiency grinding machine. This device is for grinding large quantities with efficiency. With two rollers, all grains can be crushed twice in one cycle. The crushing is done by a fixed gap between the two upper rollers. The width and roller diameter are optimised for use with drills. 2. Adjustable grain grinder. performance double roller mill with adjustable secondary gap distance. The mill has a 6inch long adjustable gap, a fixed primary gap of 0.060 inches, a fully adjustable secondary gap of 0 0.065 inches, and two eccentric adjustment devices made of stainless steel that do not wear. 3. utility value. The 12 TPI knurling of the grinder's 4L capacity effectively pulls the grain through the rollers while keeping the bowls intact. This creates an filter bed for blowing through with air while damaging the trays as little as possible. 4. Easy to use. The grinder comes with a hand crank but can also be easily operated with an electric drill with a cable. You do not need any additional attachments—just connect the drill and get started.