Type	Inside diameter(height X length)	Outside diameter(height X Length)	Circling semi diameter R	Pitch	Non-support length	Type
30.30	30x30	39x56	55.75	25	2	Opening openable upper cover
30.38	30x38	39x69		25	2
30.50	30x50	39x82		25	2.5
30.70	30x70	39x92		25	2.5