Features: Made of reinforced plastic, solid and durable, long service life. Built-in elastic rubber increase friction and prevent slipping. Easy to use, one click lock design for easy install and remove. Snap-latch design to keep you safe, more reliable and safer. Lightweight and compact size, convenient to carry and store. Perfect for fitness training, strength training, weightlifting etc. Specifications: Material: Plastic Number: 1pc/2pcs (optional) Size: 25mm/28mm/30mm (optional) Item Size: 5.7 * 5.7 * 3.3cm / 2.2 * 2.2 * 1.3in Item Weight: 50g / 1.8oz 100g / 3.5oz Package List: 2 * Barbell Clamps