The Z Poolform Mallet is not your traditional rubber mallet. It is ideal for installing theZ Poolform into theReceiver Track or liner track (vinyl liner pools). It features a larger impact surface on one side and a smaller 1.5" square surface on the other side. This smaller surface is ideal for theBendable Z Poolform . It allows you to tap on one tab at a time to make sure the form is adequately inserted into theBendable Receiver Track . It also features a soft grip rubber handle.