Small aluminum hand drill 20pc HSS wire twist drills 20 miniature drill bits range in Diameters from size 61-80 Apply only slow, gentle pressures to avoid breaking or chipping Your beads Sizes: #61 (.0390 inch) #62 (.0380 inch) #63 (.0370 inch) #64 (.0360 inch) #65 (.0350 inch) #66 (.0330 inch) #67 (.0320 inch) #68 (.0310 inch) #69 (.0292 inch) #70 (.0280 inch) #71 (.0260 inch) #72 (.0250 inch) #73 (.0240 inch) #74 (.0225 inch) #75 (.0210 inch) #76 (.0200 inch) #77 (.0180 inch) #78 (.0160 inch) #79 (.0145 inch) #80 (.0135 inch) Material:Plastic Metal Size:12 x 7 x 1cm Colour:Blue Quantity: 18 pcs Package Contents: 1 x Set Drill Bit Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.