MATERIAL: The u groove pulley block is made of 304 stainless steel, rust proof and corruption resistant, safe for indoor and outdoor use
SIZE: Wheel diameter is 2 inches, total height is 2.4 inches, u groove width of the wheel is 0.63 inches (16mm), bolt hole distance is 2.1 x 0.6 inches (L x W); more size information can be found in the third picture
LOAD CAPACITY: Duplex bearings provide silent and smooth pivot, the extra thick bracket makes it load up to 660lbs
SMOOTH MOVEMENT: The bearings inside lower the friction, making the rolling more smoothly and quiet
GREAT FOR: Lifting heavy duty items, wanshing line, home gym system, dog runner and sliding gate