What it does: Heavy-duty high-speed steel bridge reamers,expand or align existing holes through mild steel, alloys, aluminum, wood, plastic, fiberglass, or any material of similar hardness prior to rivet or bolt installation, Deburring and trimming of holes in structural materials. Application: Especially for steel, metal, alloy aluminum, brass, plastic, iron, nickel, copper, cast iron and other structural materials. Design: Tapered point design allows reamer bits to enter irregular overlapping holes, aligning bolt holes. Note: The 7/8Inch Bridge Reamer Bit is not a drill bit, only aligns the reamer with the pre-drilled hole. If you need to enlarge the hole to 7/8Inch. Must have a pre-drilled first, then reamed to 7/8Inch. Material: Made of high-quality steel, high toughness, high temperature resistance, corrosion resistance, long service life. Applies to: The reamer bit fits for Steel Metal Wood Alloy to Align Existing Hole and Enlarge Hole Function: Align existing holes and enlarge undersized holes before bolt or rivet installation Commonly used in bridge,construction,steel and automotive truck trailer industries,specially use in structural materials such as steel, metal, alloy aluminum,brass,plastic,iron,nickel,copper,cast iron etc.Three symmetrically placed flats on shank provide positive grip in portable electric and pneumatic tool Notice: 1. Before use, put some cutting oil before using the construction reamer 2. The drill bit is used to enlarge the hole to 7/8" . First there must be pre-drilled, then reamed to 7/8" Specification: Item Diameter:7/8Inch Cutting Direction:right-hand Shank Diameter: 7/8Inch Material: high speed steel Color: As shown Package Contents: 1 x tapered reamer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.