ToolUSA Toolusa Premium 12 Piece Curved And Straight Carbon Steel Files In One Ended And Two Ended Styles: KIT-FRFILE Two Styles Are Included - 6 Of One Sided Files And 6 Of Double Sided, Bent Files The one sided files are 7.5 inches long and feature 6 different styles The double sided files are 6 inches long and feature 6 different styles The carbon steel is very durable - great for all filing jobs These files will work on wood, metal, fiberglass, plastic, ceramics, and other surfaces