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RUIMI Titanium Step Drill Bit Spiral Metric Sizes 3Pcs5pcs HSS Spiral Grooved Step Drill Bit 4-12/4-20/4-32 Features :No need for a pilot hole Titanium coated to reduce friction and run cooler Large bit has 3 sided shank.Automatically deburr holes as you drill High speed steel,durable.Widely used to cut holes in a variety of material like steel, wood,...$7.50$15.99




