Mould Parting Line - Use the edge on flat or slanted to remove mold parting lines on the parts. Sprue Joints/Pouring Gates - Use the edge of flat/slanted to remove remaining sprue joints or pouring gates on parts after removal(just like using a hobby knife) The Edge Trigone shape is an essential hobby tool for model makers. Featuring a sturdy construction, its double edge and perfect for tasks like parting lines, remove nubs, and repair work on molds and sprue joints with accuracy. Round the joints - Hold your flat/slant edge in a manner that the edge is approximately 60° from the joint line. to scrape to obtain desired radius., Weight: 0.13558429113 pounds, Manufacturer: Faeymth