Fangrui Product Details Heavy-duty High-speed Steel Bridge Reamers, Also Known As Construction Reamers, Are Used To Align Existing Holes And Enlarge Undersized Holes Before Installing Bolts Or Rivets. Our 3/4inch Reamer Bits Align And Enlarge Pre-drilled Holes Ready For Bolting Makes Reaming Easier Than Using A Large Drill Bit, And The Reaming Is Smooth And Tear-free. But Before Using Our 3/4inch Bridge/construction Reamers, There Must Be An Existing Hole Or Pilot Hole Smaller Than 3/4inch. The Tapered Point Design Allows The Reamer Bit To Enter Non-linear, Overlapping Holes To Align Bolt Holes. Enlarge The Holes In The Steering Knuckle And Linkage Arms. The 3/4inch Bridge Reamer Is Not A Drill, It Just Aligns The Reamer With A Pre-drilled Hole. If You Need To Enlarge The Hole To 3/4inch. There Must Be An Existing Hole First And Then Reamed To 3/4inch. Commonly Used In , Construction, Steel And Automotive Truck Trailer Industries, Our 3/4inch Reamer Bits Are Suitable For Use On Steel, Metal, Alloy Aluminum, Brass, Plastic, Iron