Features: Material: Carbon steel Type: Air hammer pneumatic bits Including: 9 different shapes of hammer tangents, one spring. Compatibility: Air hammers can be used with pneumatic tools, such as rivet hammer, scrapper or chiseler. Application: Air chisel hammer bit are widely used for tire repair, wind pipe seam, crushing hard rock, masonry and concrete removal,etc. 9 Pieces Air Hammer Chisels: 1x Double Blade Panel Cutter Chisel 1x Sheet Metal Trimmer Chisel 1x Spot Weld Breaker Chisel 1x Straight Panel Cutter Chisel 1x Cold Chisel 1x Scraper Chisel 1x Tapered Punch Chisel 1x Chisel Blank Chisel 1x Smoothing Hammer Chisel Package included: 9x Air hammer bits 1x Spring Note: 1.Please allow 1-2mm errors due to manual measurement. 2.The head of the hammer bits include corve and flat head. 3.Due to the different image angles, some images may not display of the clear head shape, please understand, thank you! 4. The bit installed in the pneumatic sewing machine, need to connect the air compressor to use.can replace the head to use.