Ratchet Blocks Larger Type The slide blocks are used by bolting onto a short handle ratchet, then fitted into brackets on a spectacle frame to secure a load with a strap. They can be used on AA type grid. We offer two versions of the ratchet block, please see below link to the other version. UK made. Base measurements: 65mm x 60mm x 12mm Priced singular Smaller block version Short Handle Ratchet