HooAMI Stainless Steel Ball Chain Connector Clasps Jewelry Findings Silver Tone 100pcs 7mmx3mm High quality stainless steel,no fading, nondeformable,allergy free Approx:7mm x 3mm( 2/8" x 1/8");Thickness: 3mm( 1/8") Hole size: 2.5mm 0.9mm; Fit for ball chain between 2mm and 2.5mm( 1/8")dia. Jewerly making accessories Perfect for jewelry making,necklaces,bracelet,and other DIY project