Enlarging Existing Hole - As a home and , you occasionally have the need to enlarge holes to match other components./Construction Reamer Set makes it easy to get a smooth, rip-free reaming Reamer Bit Is Not A Drill - If you need to enlarge the hole to 1inch, FIRST there must be an existing hole, then expand to 1inch. It is used to align existing holes and enlarge small holes. It is drilling because you can control the final diameter more precisely, leaving a better hole shape and fewer burrs Makes Easier Work for Steering Knuckle and Coxswain Arm - The tapered tip design allows the reamer bit to enter the overlapping holes of the outlet line so that the bolt holes are aligned. Tips: Please put some cutting oil before using the reamer Round Handle for Portable Electric/Pneumatic Tools Holding System - a). three planes on the shaft - allows the drill chuck to safely hold the reamer at high torque without slipping b). the high-speed steel material c). the five-flute spiral - the chip removal is smooth Widely Apply - Industrial application (bridge, construction, steel and automotive truck trailer industries) and Home application. Suitable for sheet metal, steel, alloy aluminum, brass, plastic, iron, nickel, copper, cast iron etc Colour:As Shown Material:Aluminum+brass+HSS Package Contents: 1 set x reamer tool 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.