b'GAS ORIFICE GAUGING DRILLSINDIVIDUAL GAUGING DRILLS AND KITSDRILL AND HANDLE ARE PERMANENTLY BONDED; DRILL NUMBER IS STAMPED ON HANDLEB.T.U. / Hr.B.T.U. / Hr.B.T.U. / Hr. B.T.U. / Hr.B.T.U. / Hr.B.T.U. / Hr. B.T.U. / Hr.B.T.U. / Hr.B.T.U. / Hr. PARTDRILLNATURALNATURALLPPARTDRILLNATURALNATURALLPPARTDRILLNATURALNATURALLP No.SIZE(3.5)(7.0)(11.0)No.SIZE(3.5)(7.0)(11.0)No.SIZE(3.5)(7.0)(11.0)D420.0935221973139161067 D560.04655490776415104 D750.0210112015833081D430.0890201112844255331 D570.04304695663912916 D760.0200101614362794D440.0860187782655751663 D580.04204479633412322 D770.018082311632263D450.082017072 24144 46969 D600.04004062574511176 D780.01606509191788D460.081016658 23558 45831D660.0330276539107607 D790.01455347551469D470.0785156462212743045 D670.0320260036777153 D800.01354636541273D490.0730135301913537225 D690.0292216530625956D510.0670113981611931357 D700.0280199128155476D520.0635102381447928167 D710.0260171624274722D530.059589891271224730 D720.0250158722444366D540.055076801086221131 D730.0240146220684024D550.05206865970918888 D740.0225128518183536Gauging drill sets come in a durable heavy gauge plastic case that has a tight clasp and features easy drill removement and snug replacement.PART No. DescriptionDrill SizesDS2Case & 42 DrillsD40 Through D80DS3Case & 42 DrillsD19 Through D60DS4Case & 21 DrillsD19 Through D39DS5Case & 21 DrillsD60 Through D80239'