BoTaiDaHong 130mm Combination Rolling Mill Machine Roller Jewelry Press MarkingHigh quality Made from precision steel for ultra strength and durability. Feature Reduction gear ratio of 4: 1 allows the rollers to make one complete turn for every four turns of the rolling mill handle. This relieves the amount of force needed to operate the rolling mill. With forged handle, simple and convenient to use. Easily mounts the rolling mill to your workbench using the mounting Advantage Combination rolling mill 130 mm 5 MM max opening