MBS (pounds): 6,000. Rope Cap (inches): 5/8”. Sideplates: Orange AA. Sheave: 2 3/8" Aluminum. Mechanics: Ball Bearing. Axles: Stainless Steel. Size (inches): 4 1/4" x 3 1/4". Weight: 7 oz. Efficiency: 95.6%. Part Number: RP103BB|Weight: 0.44 lbs|MBS: 6,000 lbs (26kN)|Rope Capacity: 5/8"|Side Plates: Orange Anodized Aluminum|Mechanics: Bearing|Sheave: 2 3/8" Aluminum|Axle: Stainless Steel|Size (in): 4 1/4x3 1/4|Efficiency: 0.956