90 lb weight class. 1-1/4 inch Hex. Nothing equals the impact force of hydraulic breakers. With the best power-to-weight ratio, higher blow energy, and lower noise level than pneumatic breakers, Stanley hydraulic breakers are simply the best choice. Utility Construction Street Maintenance Repair of Water and Gas mains General Contracting jobs Featuring a feathering on/off valve that controls speed, making start up and initial tool placement easy. Diaphragm accumulator provides trouble free operation with system back pressures up to 250 psi (17 bar). Accumulator on the BR87 can be serviced without disassembling the tool.