Chicago Screws: Large: 3/8" Caps x 3/8" Posts (10 mm x 10 mm) - Rose Gold/Copper - 50 Pack Tape They have a serrated blade

They have a serrated blade

applique blocks and machine embroidered blocks and features the unique Non-Slip Coating

10mm x 45mm

Bobbin type: 15 Class

Chicago Screws: Large: 3/8" Caps x 3/8" Posts (10 mm x 10 mm) - Rose Gold/Copper - 50 Pack Tape They have a serrated bladeChicago screws are like rivets, but no setting tools required. Use a leather punch to make a hole (3 16" or 5 mm) through all of your layers, pop the front and back through the hole, and screw together. Done! Recommended for thicknesses of 1 4" (6 mm) (Medium) and slightly thicker, and 3 8" (10 mm) for Large. Note: Use "Loctite" to secure if needed. Sold in Packs of 50 Choose from: Small: 3 8" Caps x 3 16" Posts (10 mm x 4 mm) Medium: 3 8" Caps x 1 4"