Upgrade High-quality Materials: Our barbell adapter sleeve is made of heavy-duty high-quality nylon and can withstand a weight of up to 600 pounds. We provide you with long-lasting performance and security. Size: The length of the innovative 12 inch barbell adapter is suitable for most old-fashioned barbells, curl bars and plate loaded weight machines. Removable end cap for longer 1 "standard barbells. Easy to use: When using this Olympic adapter sleeve, simply attacth it on the barbells, curl bars or plate loaded weight machines.then use a wrench to tighten the hex nut.The locking screws in the product require a little more force to use. Includes: The product includes two 12 inch adapter sleeves that convert a 1 "standard barbell into a 2" barbell bar. Including 1 secure hex socket screw and 2 fixed barbell clips. Good Service: If you have any questions, please feel free to contact our customer support. We will do our best to help you! Turn your 1" standard bar or weight bar into a 2" Olympic bar or weight bar.