TheForklift Drum Lifting Attachments. Fork Truck Mounted Drum Grippers are designed for use with fork trucks fitted with fork positioners only. Easily attaches to your forks for easy drum positioning. Usable fork openings are 6½”W x 2½”H. Secure to forks with friction-lock screw mechanism. Welded steel construction. Available for use with 30 and 55 gallon steel drums.