Features: *Strong adaptability - able to convert a 1-inch standard weight bar into a 2-inch bar, suitable for a variety of fitness equipment *Safe and Stable - Designed with a hexagonal bolt locking function to ensure that the weight plates will not slip or shift during training, providing extra security. *Durable Material - Made of high-strength PP plastic, sturdy and durable, able to withstand long-term use and wear. *Easy to install - Installation is quick and easy, no additional tools are required to install and remove the adapter *There are steps at the end to effectively prevent the weight block from sliding inward. *Suitable for most vintage barbells, curl bars and flat weights, multiple sizes available, please confirm your bar diameter before purchasing Specifications: *Product Name: Barbell Bars Adapter Sleeve *Material: plastic *Size: approx. Size1: 48*200mm/1.9*7.9inch Size2: 50*200mm/1.97*7.9inch Size3: 48*300mm/1.9*1.8inch Size3: 50*300mm/1.97*1.8inch *Color: As shown in the picture *Weight: about 23g Package Content: 2 x Adapter Sleeve 2x Wrench Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data(1cm=0.39inch)