BenchReference / Drill sizes / L L Drill Bit Decimal inches 0.2900″
Millimeters 7.366 mm
System Letter
Nearest equivalents in other systems System Nearest drill Size Difference Metric 7.4 mm 0.2913″ / 7.4 mm +0.034 mm (+0.0013″)
Fractional inch 19/64″ 0.2969″ / 7.541 mm +0.175 mm (+0.0069″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.575 mm (−0.0620″)
−0.589 mm +0.589 mm L J −0.33 mm K −0.229 mm M +0.127 mm N +0.305 mm 7.4 mm +0.034 mm 19/64″ +0.175 mm ← #1 −1.575 mm tick position = true diameter · letter neighbors above, equivalents below · window ±0.59 mm
Positive difference = cuts a slightly larger hole than L. Sizes
beyond the window are listed with arrows — they are not close substitutes.
Neighboring letter sizes Drill Decimal in mm vs L J 0.2770 7.036 −0.33 mm K 0.2810 7.137 −0.229 mm L 0.2900 7.366 — M 0.2950 7.493 +0.127 mm N 0.3020 7.671 +0.305 mm
← K (smaller) M (larger) →
Compare L with another size
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this letter size is 0.2900″. See all data sources .