Fangrui Product Details Specifications: 2 Different Sizes Of Leather Goods Tools, Long Needle 18mm/0.7inch, Suitable For Locking Leather Edges With Thickness 6-12mm/2.4-4.8inch, Short Needle 12mm/2.4-4.8inch, Suitable For Locking 0- 6mm/0-2.4inch Thick Leather Edges. How To Use: Pull The Base Outward And Remove Or Insert The Fixing Pin. (do Not Forcefully Remove The Fixing Pin, As This May Cause The Solder Joint Between The Ring And The Pin To Fall Off). Features: Each Leather Stitching Positioning Pin Is . Its Base Is Knurled And Non-slip. The Needle And Ring Are Stainless Steel And Made From Rod Stock With A Smooth Exterior For Easy Removal Material: The Leather Stitching Positioning Needle Is Made Of High-quality Metal Material. The Needle And Ring Are All Stainless Steel. The Base Is Knurled And Anti-slip. It Has The Advantages Of Durability, Smooth Appearance, Not Easy To Fade, And Moisture-proof. -, Rust-proof, Long Service Life. Purpose: Leather Stitching Pins Are Used To Hold Leather In Place When Sewing Leather Items.