Blackhawk by Proto’s Obstacle Insert Sets are built around a reverse-ratcheting S-shaped wrench – a design for helping technicians work around obstructions in tight spaces – and include adaptors that let the technician turn several fastener sizes with one wrench body. Each set includes one 8-inch-long wrench body, six flank adaptors and an equal number of box heads. Each flank adaptor is designed to slip into one of the wrench openings, while each box head attaches to its corresponding flank adaptor, allowing the user to change the size of the wrench opening quickly.
The wrench body has been engineered so that the interchangeable heads do not reduce torque capacity; once in place, the adaptor transfers torque forces to the wrench body, minimizing stress on the adaptor. Sets are available in fractional (3/8- to 7/8-inch) and metric (10- to 22-mm) versions.