Specification Brand : qdyzpp BulletPoint1 : Cylinder tube Bore (I.D.) 4.5" x rod (O.D) 1.75". Please note: 4.5" bore size is not Cylinder tube O.D. Cylinder rod size is inside tube part size. BulletPoint2 : Wear rings. Piston wear ring : 114.3 mm (OD 4.5") x 107.95mm (ID 4.25”) x 9.53mm (0.375" wide), Nylon Rod wear ring : 44.5mm (ID 1.752") x 50.8mm (OD 2”) x 9.53mm (0.375" wide), Nylon BulletPoint3 : Piston seals 1 square ring and 1 O-ring. Piston Square ring: 114.3 mm x104.3mm x 3.28mm; O-ring (installed under the square ring): 103mm x 2.65mm. CPU + NBR BulletPoint4 : Rod O-ring (item 13): 44.5mm x 54mm x 5mm, CPU. There is O-ring inside. BulletPoint5 : Rod dust ring (Item 12): 44.5mm x 54mm 5.5mm /7.3mm, TPU ExternallyAssignedProductIdentifier1 : 0717025610472 ExternallyAssignedProductIdentifier2 : 717025610472 ItemName : QDYZPP for Hydraulic Log Splitter Cylinder Rebuild Seal kit for 4.5"Bore x 1.75"Rod cylinde ItemTypeKeyword : hydraulic-cylinder-accessories Manufacturer : QDYZPP Material : Plastic PartNumber : HDS54XW ProductDescription : Condition: New Part Type:cylinder rebuild seal kit Seal Size: 4.5"Bore x 1.75" Brand: Aftermarket Material :Rubber Plastic Product Description: Hydraulic Log splitter cylinder rebuild seal kit for 4.5"Bore x 1.75" rod cylinder To know whether it fits your cylinder, one good way is to disassemble and measure your cylinder to compare with each item specification. Double check each seal groove is good for our part sitting in. 1. Cylinder tube Bore (I.D.) 4.5" x rod (O.D) 1.75". Please note: 4.5" bore size is not Cylinder tube O.D. Cylinder rod size is inside tube part size. 2. Wear rings. Piston wear ring : 114.3 mm (OD 4.5") x 107.95mm (ID 4.25”) x 9.53mm (0.375" wide), Nylon Rod wear ring : 44.5mm (ID 1.752") x 50.8mm (OD 2”) x 9.53mm (0.375" wide), Nylon 3. Piston seals 1 square ring and 1 O-ring. Piston Square ring: 114.3 mm x104.3mm x 3.28mm; O-ring (installed under the square ring): 103mm x 2.65mm. CPU + NBR 4. Rod O-ring (item 13): 44.5mm x 54mm x 5mm, CPU. There is O-ring inside. 5. Rod dust ring (Item 12): 44.5mm x 54mm 5.5mm /7.3mm, TPU UnspscCode : 31410000