The PD-140 has a 107.9 mm round adapter as standard. Optionally, additional adapters can be ordered for larger posts. A 120.6 mm adapter is available for larger round posts. For square posts, a 101.6 x 101.6 or a 101.6 x 152.4 mm adapter can be mounted. For the PD-140, a special adapter has also been developed for striking sheet pile. Adapters are easy to change and attach with four bolts. The adapters can allow air to pass through at every corner so that the postdriver can not come off of the post when it is activated.