Extended neck for hard to reach burr points. Pull down the tab to extend the neck up to 2 inches and reach tight areas. The burr has a rotating head to adapt to irregular shapes. Total 16 knives in a 3 size kit. Includes 6 BS1010 knives made of 64 HRC steel for steel, aluminum and plastic. 5 BS1018 blades in 67 HRC stainless steel for harder materials such as stainless steel. The kit covers multiple burr sizes for versatile use. Multiple material applications. Works on steel, aluminum, copper or PVC pipes, automotive parts, gears or other cut metal parts to clean metal edges. It is also effective for refining the edges of 3D printed plastic objects. A solid installation tool for professional plumbers, suitable for industrial professionals, machine operators or DIY users. High performance blades. The blades are tempered high speed steel to stay sharp, strong and abrasion resistant. HSS steel typically lasts about 80% longer than standard steel, reflecting our emphasis on performance. Comfort and durability. The device includes a sheath for the ergonomic aluminum handle, quality processed parts and extra blades, designed for long lasting use.