Irwin 10220 Unibit Fractional Hole Enlarging Step Drill Bit #20 In Stock It provides a tight seal

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

For heavy duty use

Fingertip grips on middle

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

Excellent Wear and Abrasion Resistance

Irwin 10220 Unibit Fractional Hole Enlarging Step Drill Bit #20 In Stock It provides a tight seal"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