Made of Maple hardwood, 10mm and 3/8" diameter steel shafts, and commercial grade, heavy duty Swiss gears. It will wind balls up to 1 Lb. and greater. The yarn guide arm can be swiveled 180 degrees to allow for 5 different angles at which the yarn supply can be positioned relative to the ball winder. Includes an integrated yarn tensioner which can provide variable tensioning levels. A Small Diameter Spindle assembly is available which makes a smaller center hole ball - kit makers prefer this size because they can make smaller balls that look more attractive. Our Yarn Ball Cores™ are designed to work with our ball winder spindle. Two optional motor drive systems (Power Base™ and Power Base Lite Plus™) are available. These units offer a commercial grade high tech motor drive option for our Heavy Duty Ball Winders. 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.