What File is needed for sharpening?

I've listed the File, File with Handle along with the Filing kit for you. 350 116 - Chainsaw Chain Sharpening File 5/32"/ 4.0mm / 3/8" Picco or 1/4" Pitch Each - Genuine Stihl - OEM No. 56057724006 https://www.lsengineers.co.uk/catalog/product/view/id/9966 5605 750 4327 - File Holder with 5/32" File for 1/4" & 3/8 Picco Chain - 5605 750 4327 https://www.lsengineers.co.uk/catalog/product/view/id/33146 5605 007 1027 - Stihl Filing Kit for 1/4" & 3/8 Picco Chain - 5605 007 1027 https://www.lsengineers.co.uk/catalog/product/view/id/33115