Our micro drill bits are great for precision drilling of wood, plastic, and soft metal. This set includes 20 micro drill bits sizes 61-80 and a convenient plastic storage case. These small drill bits can be used with any rotary tool, but they are best used with a push drill or pin vise such as our Mini Push Drill [#402], Push Drill [#403], or Swivel Head Pin Vise[#407]. Includes micro drill bit sizes:#80 [.0135"]#79 [.0145"]#78 [.0160"]#77 [.0180"]#76 [.0200"]#75 [.0210"]#74 [.0225"]#73 [.0240"]#72 [.0250"]#71 [.0260"]#70 [.0280"]#69 [.0292"]#68 [.0310"]#67 [.0320"]#66 [.0330"]#65 [.0350"]#64 [.0360"]#63 [.0370"]#62 [.0380"]#61 [.0390"]