I purchased these after the recomendation of others to buy the Delta blades for my jointer. Upon recieving them I opened the package to inspect them prior to installing them. They where sharp and "visually looked" nice, but when I got my calipers out and started checking the individual blades I found that they where not parallel or straight. When I measured along the 5/8 side of the knive I found the edge to vary .02" from the ends to the middle. To me this is unacceptable and not worth the $69 I paid for them. Luckily Amazon made the return process easy.