Vendido individualmente- £ 17.99 cada uno
 Once cabezales intercambiables para elegir: 4.0 mm, 5.0 mm, 5.6 mm, 6.0 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.7 mm, 6.8 mm y Spline Drive.