Supports the following standards: ASTM D4543, C31, C39, C192, C617 No capping material is required to finish the specimen end. Grinding disks typically finish 3,000 - 5,000 pieces before replacement is necessary. The unit is safe and economical. This unit comes with accessories for grinding, 4" (100 mm) and 6" (150 mm) cylinders. For grinding 3" (75 mm) cylinders please purchase H-2956.8. Other sizes can be finished using an optional jig, please enquire. Fragile or low strength materials can be finished satisfactorily. The automatic cylinder feeding decreases skills needed for operation while further increasing safety. The end grinder is conveniently mounted on lockable castors providing easy mobility, and is relatively small in size, so storage space is kept to a minimum. Grinds planeness and parallelism of test cylinder ends Planeness Accuracy: 0.002" (0.05mm) Grinding Time: 90 to 120 seconds per end Ready to use for 6" x 12" (150mm x 300mm), 4" x 8" (100mm x 200mm) test cylinders Easy access to water inlet and outlet Diamond-grinding wheel included