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RMT 4130 series of chipping hammers have a locking mechanism with four bolts which gives higher airflow and ease of service to the tool. It comes with a D handle with the outside trigger. RMT 4130 series 4 bolt chippers are available in 2, 3, and 4 cylinder options and with Round or Hex shanks to choose from. Hex shank prevents chisel rotation. This chipper comes with a muffler assembly. Its unique ring valve design provides a harder blow in tough conditions. The spline locking system is there for extra safety as it prevents loosening of the handle or cylinder.