The Model 307 needle scaler cleans irregular surfaces easily. These versatile scalers remove rust, paint and other coatings from metal; peens welded joints and removes slag; cleans castings; chips stone, concrete and brick. APTft s newest tool, the Scaler/Needle Scaler, is designed and crafted with the same attention to detail and careful choice of materials that have made our tools a benchmark of quality for over 60 years. A notched bayonet-style needle housing enables easy adjustment as needles wear, and allows quick conversion between needles and chisel without special tools. Standard Features: Rubber-faced throttle valve for positive seal, Level-type throttle for easy control, Alloy Steel cylinder. Models 307 7in. needles include attachment with set of 19 steel needles.