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Sold in Packs of 10 Drills-These popular HSS (High Speed Steel) twist drills have the same diameter shafts as the drills themselves. Used by jewelers everywhere for drilling small holes into all sorts of non-ferrous metals like gold, silver, copper and brass. Use by hand in a suitable adjustable chuck handpiece or for best results with a drill press. Can also be used in adapter chucks (see below) so you can use them in collet style quick change handpieces.

These sizes, from the smallest #80 ( 0.34 mm) to the larger #50 (1.78 mm) are sold in packs of 10 drills. We also have sizes #49 to #30 available in packs of 5 drills (see below), and many other drills available in the sizes below in different shank sizes and metal types.

Drill #	MM Diameter	Inch Diameter	Closest Metric
#80	.343 mm	.0135"	N/A
#79	.368 mm	.0145"	N/A
#78	.406 mm	.0160"	0.4 mm
#77	.457 mm	.0180"	N/A
#76	.508 mm	.0200"	0.5 mm
#75	.533 mm	.0210"	N/A
#74	.572 mm	.0225"	N/A
#73	.610 mm	.0240"	0.6 mm
#72	.635 mm	.0250"	N/A
#71	.660 mm	.0260"	N/A
#70	.717 mm	.0280"	0.7 mm
#69	.744 mm	.0293"	N/A
#68	.787 mm	.0310"	N/A
#67	.813 mm	.0320"	0.8 mm
#66	.838 mm	.0330"	N/A
#65	.889 mm	.0350"	N/A
#64	.914 mm	.0360"	0.9 mm
#63	.940 mm	.0370"	N/A
#62	.965 mm	.0380"	N/A
#61	.991 mm	.0390"	N/A
#60	1.016 mm	.0400"	1.0 mm
#59	1.041 mm	.0410"	N/A
#58	1.067 mm	.0420"	N/A
#57	1.092 mm	.0430"	N/A
#56	1.181 mm	.0465"	1.1 mm
#55	1.321 mm	.0520"	1.2 mm-1.3 mm
#54	1.397 mm	.0550"	N/A
#53	1.511 mm	.0595"	1.4 mm-1.5 mm
#52	1.613 mm	.0635"	1.6 mm
#51	1.702 mm	.0670"	1.7 mm
#50	1.778 mm	.0700"	N/A

Warning: Cancer and Reproductive Harm www.P65warnings.ca.gov.

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Packs of 10-High Speed Steel Twist Drills Sizes #80 to #50

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Packs of 10-High Speed Steel Twist Drills Sizes #80 to #50

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