I purchased this, but the specifications were different from what I already have. I tore the package when I opened it, but the contents are unused, having only been tried on. I bought it on July 13th, so there is no rust at all. Compatible with 120mm folding saw replacement blades, SGPS-18. - Size: 120mm - Application: For SGPS-18 - Optimal Cutting Guide: Approximately 60mm - Quantity: 1 blade Thank you for looking.