Non Powered tool to hand drill and resize small holes in metal, plastic, ceramic, & wood. 20 Miniature drill bits r ange in diameters from size 61-80. The set includes 20pc HSS twist drill bits in storage plastic case and an aluminum hand drill 20pc index bit set includes the following sizes: #80 (.0135") #70 (.0280") #79 (.0145") #69 (.0292") #78 (.0160") #68 (.0310") #77 (.0180") #67 (.0320") #76 (.0200") #66 (.0330") #75 (.0210") #65 (.0350") #74 (.0225") #64 (.0360") #73 (.0240") #63 (.0370") #72 (.0250") #62 (.0380") #71 (.0260") #61 (.0390")