This trailer axle grease seal is made of high-quality NBR rubber and spring steel. The spring steel structure combined with a double-lip design, double-layer sealing inside and outside, anti-leakage lubricant, and can be used effectively and lastingly, is strong and durable, and is not afraid of sun and rain. trailer axles grease seals size is (1.719"I.D. x 2.565"O.D.),Fits vehicles up to 3500 lbs, most 5-bolt wheels, EZ-Lube axles and #84 spindles.