POR Outside Diameter Air Gage

	It is often used when work pieces are smaller. This is a type of measurement in which a work pieces is inserted into the ring.
Chart 1
Chart 2

Size D	A	B	Chart
4 to 8 mm	50	20	1
8 to 14 mm	50	20	2
14 to 20 mm	50	20
20 to 30 mm	60	22
30 to 40 mm	75	25
40 to 50 mm	85	28
50 to 60 mm	100	30