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The chart below shows drill bit sizes by number, fractional standard, and metric units converted into actual size and metric jet size. There are more fractional and metric drill bits available, but this should cover most needs for small carburetors.

Bit Size…...Inches…………… Millimeters…..Jet Size
#80…………. 0.0135……………. 0.3429………… .34.29
#79…………. 0.0145……………. 0.3683…………..36.83
1/64"………... 0.015625…………..0.3969…………..39.69
#78.………….0 .016.…………….0.4064…………...40.64
#77…………..0.018.……………..0.4572.…………..45.72
#76.………….0.02…………….…0.508…...………..50.8
#75.………….0.021……………...0.5334..………….53.34
#74…………..0.0225………….....0.5715……….......57.15
#73…………..0.024…………...…0.6096…………...60.96
#72…………..0.025…………...…0.635…………….63.5
#71…………..0.026……………...0.6604…………...66.04
#70…………..0.028…………...…0.7112…………...71.12
#69.………….0.0292.………....…0.74168…..……...74.168
0.75mm……...0.0295.………........0.75……………...75
#68………….0 .031.…………......0.7874…………...78.74
1/32".………..0.03125...…….........0.7938…………...79.38
#67…………..0.032......………….0.8128 …………...81.28
#66.………….0.033.......…………0.8382 …………...83.82
0.85mm…...…0.0335........……….0.85......…………..85
#65…………..0.035.......…………0.889........………..88.9
#64....……….0.036…………........0.9144........………91.44
#63.....………0.037…………........0.9398.....…………93.98
0.95mm……0. 0374..…..........……0.95 ……………...95
#62…………..0.038….......……….0.9652……………96.52
#61…………..0.039..……......……0.9906……………99.06
1mm…………0.0394………..........1.0 ……………….100
#60……………0.04…..………......1.016……………..101.6
#59…………..0.041…………........1.0414…………....104.14
#58…………..0.042………............1.0668……………106.68
#57…………..0.043..………..........1.0922……………109.22
1.1mm……..0.0433…….............…1.1 ………………110
#56…………..0.0465……..........…1.1811…………….118.11
3/64"………..0 .046875…...............1.1906 …………..119.06
1.25mm……0.0492….…................1.25……………....125
1.3mm………0.0512……...............1.3 …….…………130
Alleyoop