Turn your 1inch standard barbell or weight post into a 2inch weight bar or weight post. Great for older style barbells, curl bars and plate loaded weight machines Made from heavy duty and high quality PP with a metal hex bolt. Includes 1 Hex key to tighten and loosen the metal hex nut. End cap is REMOVABLE for use with 1inch standard posts The outer diameter of this adapter is designed to be exactly 50mm, which matches any 2inch weight board and barbell collar. fit most older style barbells, curl bars and plate loaded weight machines. size:about 200x50mm Material:PP colour:Black Package Contents: 2 x barbell Adapter Sleeve 1 x Hex key Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.