The required 5/16-inch hole can be drilled with a gas- or battery-powered rotary hammer on a site with no power.
A single power cartridge requires a 10-inch-deep hole; each additional cartridge adds 2 inches more (up to a maximum 16 inches for 4 cartridges).
In addition to the three-head kit shown here, the manufacturer also offers an air-operated single-head kit, as well as a lower-cost single-head kit that’s activated with a pull cord.
Three holes are charged and ready to fire. The uppermost portion of the outcrop had already been broken free by a previous round.
This is an example of rock in which an exploding charge has bisected the drill hole, revealing the pocket at its bottom that held the power cartridge.