According to CZ Standard
TRADE MARK CZ | PITCH | INSIDE WIDTH | ROLLER DIAMETER | DIMENSION | DIMENSION | ATTACHMENT HOLE DIAMETER | DIMENSION | DIMENSION | DIMENSION | BREAKING LOAD | | | p | b1(min) | d1(max) | A | B | D | E | C | H | FB(min) | | mm | mm | mm | mm | mm | mm | mm | mm | mm | N | | 08 B | 12,70 | 7,75 | 8,51 | 11,50 | 8,90 | 4,30 | 12,70 | 18,70 | 18,70 | 18 690 | | 10 B | 15,875 | 9,65 | 10,16 | 14,00 | 10,30 | 5,30 | 15,875 | 23,87 | 22,375 | 23 310 | | 12 B | 19,05 | 11,68 | 12,07 | 17,00 | 13,45 | 6,40 | 19,05 | 28,05 | 26,05 | 30 345 | |