20-piece miniature drill set in plastic dispenser with one each of high speed twist drills in wire gauge #61 – #80. Drill soft metals, wood, plastics and acrylics for jewelery, bead making, model making RC/plane/boat/train. Any of these twist drill sizes can be used in the following Zona hand drills: 37-140 Swivel Head Pin Vise, 37-145 Double Ended Pin Vise. #61-#78 fit Zona Tool Holders: 37-120 and 37-130. #70-#80 fit Zona 37-160 Spiral Hand Drill. #61-#68 fit Zona 37-170 Small Pin Vise. They may also be used with other hand drills that hold wire gauge twist drills or rotary tools such as Foredom®, Dremel®, etc. with micro chuck.