6902 Style has both external and internal radius on each leaf.
Available in inch radius sizes 1/32-17/64 and 9/32-33/64
Available in metric radius sizes 0.75mm-5mm and 5.5mm -13mm
6903 Style has separate leaves for external and internal radii.
Available in 1mm-7mm; 7.5mm-15mm;15.5mm-25mm
6925/6926 Style has separate gauges for each radius.
Five measuring positions on each gauge.
Available in both metric and inch radii.