Designed to offer precice control through a high power-to-weight ratio and a teasing throttle for progressive hitting frequency, CP 4608 and CP 4611 Rivet Busters are designed to prevent blank firing when a unit’s rubber bumper is 75% worn. Used for concrete demolition and bridge work, they have the same hitting power as a 60-lb. breaker for half its weight. Units are available in a choice of cylinders and a choice of forged steel handle: an open-grid handle with outside trigger of a D-shaped handle with inside-the-handle trigger. Chicago Pneumatic. 800-760-4049.