Three gripping features are provided, a dovetail for gripping onto a 35mm external diameter, another for opening into a 45mm recess and a parallel central bore for gripping onto a 35mm diameter by 12mm long spigot. Recommended range: 30-50mm internal, 45-65mm external. Although designed to fit the 80mm chucks they will also fit the 100mm and 125mm versions.
N.B. The finish may be either silver or black due to changes in legislation regarding passive zinc plating.