All of SideTool’s trencher attachments are patented or patent pending. All of our trenchers are 100% designed and manufactured in the US with 100% US Steel. We give you a 10-day money-back guarantee if our product does not perform as advertised(see terms & conditions). We back that up further with a two-year warranty, exceeding industry standards (see terms & conditions). We pride ourselves on the outstanding quality of our trenchers as well as our exceptional customer service.