Check the listing for details. Diamond Stitching Chisel 4 mm, 4 Prong # 88046-04. Color: Black, Condition: New. Listed at 12.99 USD. This chisel works with 4 mm or less wide thread or sinew. It is the strongest chisel available and will last for years of dependable use without bending. Manufactured with hardened 41xx steel and case hardened afterward forming gives these incredible strength and toughness. The electrophoresis coating in black gives protection from corrosion and adds a true industrial look. The textured handle will prevent your hand from slipping giving you better control. Make sure to use these with a mallet and cutting board underneath like the Professional Cutting Board available in our store to keep the point like new. The 4 mm line includes a 2-prong, 4-prong and a 6-prong chisel. Please feel free to message with any questions. Thank you for looking. Also available are the same quality chisels for 2 mm wide thread and 3 mm thread or sinew. The width of the prongs are 2 mm and the space between the prongs is 4 mm as well.