Internal clicker plates fit inside the recessed opening under the thumb screw. ICP9 Outer diameter 9 mm, inner hole 4 mm X 4 mm ICP78 Outer diameter 7.8 mm, inner hole 4.5mm X 4.5mm - This one fits the Bonika Rose shear and other similar shears. Some have one side flat but both fit the Rose. ICP7 Outer diameter 7mm, inner hole 3.5mm...