APT's Scaler and 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 with special tools.
The needles clean irregular surfaces easily.  This versatile scaler removes rust, paint, and other coatings from metal; peens welded joints and removes slag; cleans castings; chips stone, concrete and brick.
Features:
Rubber-faced throttle valve for positive seal
Lever-type throttle for easy control
Alloy steel cylinder
Models 307 (7" needles) includes attachment with set of 19 steel needles