Shop All Kingpin Circular Barbell - 12G - 5/8" QTY Add to Cart Adding to cart... SKU: CIR-B12-58-10P $14.99 In Stock QTY Add to Cart Adding to cart... QTY Add to Cart Adding to cart... QTY Add to Cart Adding to cart... Login to add favorites Added to your Favorites. 12 gauge5/8"