Easy to Operate: a professional touch trigger not only adds comfort but gives users better and stop control Replacement Descaling Needles: high manganese steel material, impact- design, size about 0.12 x 7.09 inches/ 3 x 180 mm Package Includes: the product includes a compact air needle scaler and 40 replaceable descaling needles to extend the service life of the product 12 Hardened Steel Needles: this compact air needle scaler has 12 hardened 3 mm steel needles, working trip: 6-7mm, blows per minute: 4000bpm Widely Used: very suitable for preparation, including removing rust, dirt, paint and welding slag from hard metal surfaces, suitable for a variety of metal items such as cars and boats, Weight: 3.61006954025 pounds, Manufacturer: Tuidzljd