BODYMAKER Smith Machine Parts 6 holders For 60x60: 2 each on the left and right sides For 50x50: 6 holders per side In that case, please prepare the bolts yourself. Inner diameter is 25mm~ For the uprights On unused upper holes, you can place 0.5kg or 1kg weights... On unused lower holes, you can place 20kg plates... The white frame in the second photo is not included in this product. Discounts are only for repeat customers. Made of metal. Some plating is peeling. New metal 50mm holders are around 3500 yen to 4000 yen.