Tried cutting 3 mm sheeting blade went blunt within 30seconds very few teeth left after 1minute used 4 blades to cut 2ft let blade do the work went blunt next blade pushed on it went blunt next blade used cutting fluid again went blunt last blade tried different angle still went blunt. Best thing to cut with these blades is wet paper. At over £15 a blade what should of been a simple job turned out to be a expensive nightmare. Will stick to a normal reciprocating blade a lot cheaper and quicker.