Precision-built for 3×3 uprights with 1-inch holes Full UHMW (Ultra-High Molecular Weight) Polyethylene liner protects your barbell knurling Grooved end pin eliminates side-to-side wobble Knurled grip handle for one-handed installation and removal Sandwich-style construction for secure barbell racking Quantity: Sold in pairs Upright Size: 3x3 Pin Size: 1-inch Dimensions: 6 in (W) × 8 in (D) × 9.5 in (H) Weight: 6.8 lb each