Summary This is a contoured base for crochet hooks, size I and J, providing better grip and stability. The hole measures 8.5mm in diameter, so the base of your hooks may vary. Use a dab of hot glue inside for additional hold. Print Settings Printer: QIDI Tech 1 Rafts: Yes Supports: No Resolution: .2mm Infill: 10% Notes: Print vertically with a raft for best strength and virtually no cleanup. Post-Printing Hot glue a little bit of hot glue in the channel before inserting the needle will help with stability of your hooks are different sizes, or you prefer more needle sticking out.