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 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 Reamer Dia.: 13/16 inch Color: As Shown Material: high-speed steel Package Contents: 1 x Bridge 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.