This is used to install snap rings on the backside of all 1/4 Turn Fastener/Camloc® (C-Lock) 4002 series grommets. The conical insert spreads the ring while the tube handle pushes it on to the grommet. Precision CNC machined from carbon steel to very close tolerances to eliminate the possibility of the snap ring jamming in the handle. Zinc plated for long life. The rubber tip feels comfortable in the palm of your hand and prevents fatigue when installing large quantities of grommets.