Description: Material:Collars are manufactured from high-strength cast iron with plating. Function: Designed for secures the position of dumbbell on the bar. To provide balance and stability securely. Suitable: Only suitable for electroplating solid barbell rod with a diameter of 2.3cm/0.91 inch. Easy Install: Quick lock and release, easy and convenient installing/removing. Application: For fitness training, overhead press, deadlifts, bench press, or any other workout using Barbell. Specification: Material: Cast iron Color: Silver Inner Diameter: About2.3cm/0.91inch Suitable: Only suitable for electroplating solid barbell rod with a diameter of 2.3cm/0.91 inch Types: 1(Nut Type), 2(With Lock) Quantity: 2pcs/pack Package includes: 2pcs x Barbell Collar Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.