Rolling Mill 4-in-1 Flat Square Round Half-Round Electric Roller Mill, Jewelry DIY Tool, 0.03-7 mm Adjustable Thickness, Stable & Even Rolling, for Pressing Ductile Metals, Gold, Silver, Copper Pinch-Prevention Design Adjustable T-Shaped Bar Jewelry Projects Detachable Rollers Precision Grooved Rollers Motor Roller Drive Ratio: 3.77:1,Main Material of Exterior Parts: Steel,Top Adjustment Gear Drive Ratio: 2.8:1,Item Model Number: KD-Y1232,Roller Diameter: 1.93 in / 49 mm,Roller Material: Alloy Steel,Flat Sheet Size: Approx. 2.36 in / 60 mm Wide, Adjustable from 0.03-7 mm,Roller Length: 4.41 in / 112 mm,Square Sizes: 10 Sizes, 1 / 1.