Irwin 10220 Unibit Fractional Hole Enlarging Step Drill Bit #20 In Stock 5/8" to 11 spindle-wide flexibility

5/8" to 11 spindle-wide flexibility for mounting most popular accessories

It provides a tight seal and gives a layer of waterproofing protection

For heavy duty use

Then with the tripod fixture you snap the head of the screw off

Flexible PVC yet durable

Irwin 10220 Unibit Fractional Hole Enlarging Step Drill Bit #20 In Stock 5/8" to 11 spindle-wide flexibility"IRWIN" ENLARGING STEP DRILL BIT Drills 9 16" to 1" holes in 1 16" increments. Has 8 steps on bit. High speed steel bit. Single flute cutting edge for greater control through steps. Cutting edge provides a true round hole. Three flatted shank (1 2")prevents slipping in drill chuck. Ideal for drilling holes into thin materials such asstainless steel, copper, brass, aluminum, plastic and laminates. Pilot hole required. Carded. WARNING: Cancer and