6mm: diameter 6mm, thickness 2mm, ring hole 1.5mm
8mm: diameter 8mm, thickness 2mm, ring hole 1.5mm
10mm: diameter 10mm, thickness 2mm, ring hole 1.5mm
12mm: diameter 12mm, thickness 2mm, ring hole 1.5mm
14mm: diameter 14mm, thickness 2mm, ring hole 1.5mm