Four Pieces Bottom Roller For John Deere 50G Heavy Duty Excavator Undercarriage. Fits John Deere 50G Excavator Undercarriage Heavy Duty. 6.69″X6.69″X10.6. Material: 50 MnB Steel. Surface Hardness: HRC52-60, Deepth:5mm-10mm. Technique: Forging and Casting. Forged from 50Mn round steel with good hardenability. The heat treatment process of quenching and tempering and medium frequency surface quenching ensures its strength and wear resistance. Two pieces roller shell rim. Heat treated shells for body strength and longer wear life. Heat treated for a deep uniform hardened depth that provides wear life equal to link wear life. Shaft and bearing designed to carry and turn with heavy track weight forged and heat treated for strength. Bearing surfaces are hardened and polished to reduce friction and wear. Center flange absorbs side thrust from roller shell. Supports the bronze sleeve bearing. Cast from iron to absorb loads without permanent deformation. Large lubricant reservoir to reduce heat build up. Sleeve design provides a large surface area for better load distribution. Inner diameter surface is polished to a smooth finish. Soft bronze coating in the bearing absorbs any small foreign particles before they can damage the shaft and seals. Please make sure it will fit your machine before purchasing. So we could help you solve the problem well. (On Sundayis our rest day). If you want me send the item to another address, please send me a message. Many of our products have overseas warehouses, including Australian warehouses, American warehouses and. Please contact me before you return it. The item is lost during transit; b. The item is damaged during transport; c. The item in the actual use of the process of quality problems. Very appreciated for your support. We will do our best to solve your problem as soon as possible. Feedback is very important to us. Good communication can fix all problems, we always believe that as long as you are willing to communicate with us, we will give you a satisfactory answer. Thank you for choosing us and have a great day! Welcome to my shop, We offer an extensive range of products selected by our professionals. Superiority in details and quality is a high priority. We also have a high-standard team, qualified by authorized organizations to ensure products are of the highest quality. We work hard to make sure EVERY CUSTOMER 100% approvingly.