Specifications: Material: ABS Plastic & Metal Internal diameter: 30mm(1.2") Size: app.5cmx1.2cm/1.97''x0.47'' Main color: Silver with Black Quantity: 1 Pair ( 2 x Barbell Locks ) Package includes: 2Pcs x Barbell Lock (No retail package) Quantity:1 Pair ( 2 x Barbell Lock ) They will fit all standard 1.2" hole (3cm). Prevents plate weights from sliding off the bar. Rubber grip handles give you comfortable feeling. Use to lock weightlifting barbells or dumbbell bars.