This 50 Piece Custom Bush, Bearing, and Seal Driver Set served me will. I was able to replace bushings and seals in a Combine pulley. This was a tough task and a good test. I was able to complete the job with ease and without taking the pully to the Dealership. Great set for anyone who does their own repairs and wants to avoid costly Dealership charges. The disks are made of good quality steel to withstand press pressure. The plastic case is of good quality. I recommend this set for those who want a wide size variety, price, and quality.