Small: 1.5 inches (3.8 cm) Width x 0.6 inches (1.5 cm) Width

Best Suited for 2mm-4mm Figaro, Cuban Curb & "Flat" Chains / 1mm-2mm for Rope, Franco and "Thicker" chains.

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Standard: 1.9 inches (4.8 cm) Length x 0.7 inches (1.8 cm) Width

Best Suited for 4mm-6mm Figaro, Cuban Curb & "Flat" Chains / 3mm-4mm for Rope, Franco and "Thicker" chains.