Made of Maple hardwood, 10mm and 3/8" diameter steel shafts, and commercial grade, heavy duty Swiss gears. Ball Winder includes 2 heavy duty table clamps (5/16" diameter L-bolts). These allow for mounting to table thicknesses of up to 2.5". Our clamping systems are preferred by most fiber artists. 1 year limited warranty for both consumer and commercial use. Designed and manufactured in the USA with old fashioned engineering expertise and quality materials and manufacturing processes.