Cover Buttons Refill - 1 1/8 Inch - Size 45 - WIRE Loop Back - Qty 50 Size 45 (1 1/8" - 28mm) - Wire Backs Refill Pack 50 sets (50 shells and 50 wire loop backs) Assembly tool is NOT included with this refill pack. An assembly tool is needed to cover these buttons with fabric. Cover buttons have been tested for lead and meet CPSIA regulations regarding children's products. Lighter weight and thinner aluminum won't weigh down your project, making these perfect for weight-sensitive items such as earrings. Not recommended for use with heavy-weight fabrics.