mm x inch 40 × 1.1/4″ 50 × 1.1/2″ 63 × 2″ 75 × 2.1/2″ 90 × 3″ 110 × 4″ 20 × 1/2″ 25 × 3/4″ 32 × 1″ 40 × 1.1/4