Use the SL5 Snap Lock Punch to create tabs for locking vinyl plastic skirting and siding to finishing trim. Punch raises a high projection to compensate for natural relaxation of vinyl plastic. It also works well on aluminum siding but is not recommended for steel. NOTE: The SL5 should not be used when PERMATABS are required to snap into finished trim. For this application we recommend using the Malco SL1R or SL2R Snap Lock Punch. PERMATABS is a trademark of C & H Enterprises. Not Recommended for use below 32 degree F (0 degree C).