The maintenance tool is economical: it can quickly repair damaged bolts and fastening nuts and turn rough edges into smooth edges. You don't have to spend time and money looking for hard-to-find or expensive replacement bolts. Excellent design: the deburring tool has a quick-release hexagonal handle, which is compatible with most equipment and can be replaced quickly and easily. Hollow carving design helps to remove debris, reduce debris accumulation and help to dissipate heat during deburring. Tip: Start with the lowest speed, gently apply pressure to remove burrs, and then gradually increase the speed. Do not activate the screwdriver until the drill bit completely covers the screws/bolts to avoid control problems. Using lubricating oil can improve performance. This is a high quality deburring chamfering tool, thread chamfering tool, and screw alloy trimming tool. It's a must have tool for any DIY enthusiast or professional. [High Quality Material]: This Deburring External Chamfer Tool is made of durable alloy material, is sturdy and durable, can easily shave the outer edge of flat bolts, can withstand heavy use, and has a long service life. Colour:Blue Material:alloy Size:20/25mm Package Contents: 2 * Deburring chamfering 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.