HOUSWEETY 10PCs Silver Tone Adjustable Ring Base Blank Size 8 Fit 25mm(1") dia. Material: Copper(Lead and nickel safe); Main Colour: dull silver tone(not silver plated); Hole size: 18.3mm Thickness: 0.8mm; Weight: 33.4g; Perfect findings for making jewelry.Every findings has its unique design and style and theme, hence the necklaces and bracelets made with them are unique and represent your own fashion.