Lasts up to 50 times longer than an HCS blade in tough material - There's softwood, there's hardwood - and then there are those tough woods that destroy saw blades and cause frustration. Wet wood, thick pressure-treated boards, and knotted live roots or thick branches all fall into this unpleasant category. The good news is that the Expert 'Tough Wood' can cut them all. The Bosch Expert 'Tough Wood' reciprocating saw blade gets its outstanding durability from Bosch Carbide Technology - the hardest metal is incorporated into the tooth structure with advanced design and manufacturing techniques. The extra-large chip spaces provide very fast chip evacuation, allowing for quick and efficient cuts. Landscapers, carpenters and craftsmen in particular will appreciate the Bosch Expert 'Tough Wood' reciprocating saw blade. It's so tough and durable, you can cut roots to remove trees and hedges without worrying about the ground and the stones within. Fits all reciprocating saws with an S-shank.