These tools just work. The CH3R is the best tool we have found at almost any price. The quality, long proven design and construction combine to maximum productivity while greatly reducing the maintenance associated with most other chipping hammers. The 4-bolt handle and outside trigger are rugged enough for any job site or maintenance task. The AM-CH3 Chippers can be equipped to accomodate almost any chisel variety. Chucks are available in round or hex shank. Optional round collar retainers and ball retainers can be installed at any time.