4:1 reduction gear Box machined from aircraft quality aluminum, then anodized Black for durability precision hobbed Gears from solid steel (not casted Gears) Rolling Mill body is one piece solid construction cast from precision steel for ultra strength and durability; handle is forged, not cast with an ergonomically designed Wood handle Wire section: 6 square grooves, 3.5mm to 1mm - flat section: 61mm wide - 1/2 round grooves: 3: 4x1. 5mm, 3x1. 25mm, 2.5x1mm Professional quality at an affordable price and Made in the USA