According to the product groove shape, spiral step drill bit heli can be divided into straight groove, spiral groove, arc groove three categories; According to the number of product spiral step drill bit bit can be divided into single edge, double edge, three edge, four edge and multi edge step drill; Step Drill is normal for the national standard, in the daily industrial use of most customized non-standard, general production Spiral Step Drill Bit manufacturers can provide drawings can be produced.
2022/12/16
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