Our next generation pin knockers keep operators' hands 2.5 feet away from sledgehammer strikes, improving safety over traditional models. The pin knockers come in three head sizes ranging from 1 to 1.5 inches in diameter and are made of steel and impact-absorbent plastic with ergonomic handles and tethers for use at elevation, weighing between 15 to 24 pounds. They have specified dimensions for parts like the strike and pin zones and are required by several major oil rig companies.