HSS STEP DRILL 产品附加描述 Item No. Size Step Incremental Length Shank PTHSD001 3/16"-1/2" 6 1/16" 3-1/8" 1/4" PTHSD002 1/8"-1/2" 13 1/32" 3-1/8" 1/4" PTHSD003 1/4"-1/2" 9 1/16" 2-3/4" 3/8" PTHSD004 3/16"-7/8" 9 1/16" 2-3/4" 3/8" Item No. Size Step Incremental Length Shank PTHSD005 4-12mm 5 2mm 66mm 6mm PTHSD006 4-12mm 9 1mm 66mm 6mm PTHSD007 4-20mm 9 2mm 75mm 8mm PTHSD008 4-22mm 10 2mm 79mm 8mm PTHSD009 4-30mm 14 2mm 100mm 10mm PTHSD010 10-20mm 11 1mm 85mm 10mm PTHSD011 20-30mm 11 1mm 88mm 13mm