Pinch blade system accepts floor stripper blades of any make & size; Stump Grinder Chipper/Shredder Blowers Earth Drilling. All in Earth Drilling Serving Newburyport, MA. Driven by New Media Retailer. It runs like a saw blade but includes steel bits clamped to the disc. The teeth of the blade are staggered in order to create multiple strike zones, causing a chewing effect on the stump. When considering the conversion of existing equipment into a homemade stump grinder, keep in mind that a stump grinder blade is oriented vertically, making.