SL5 SNAP-LOCK PUNCH MALCO | Add snap lock plastic skirting and siding to finishing trim. Makes tabs in the cut edge of siding panel. Used as a finishing course at top of wall or below window. Tabs lock into utility 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. Throat depth of 3/8 in and length of 9 in.