DPBI Internal Brake Roller / Speed Controller Products Features: 1. Speed of pallets is controlled under 0.3 meter/second. 2. Self-adaption to different weights, steady braking force. 3. Long service life. Maintenance-free. Zero energy consumption. 4. Dia:80mm 5. Pallet weight: 200KG - 1500KG Installation Instructions 1.Fix one bracket (opening socket upward) with bolts and nuts at the inner side of rack. 2.Put milled flat in opening socket of fixed bracket, put the other end into another bracket, fix it at the inner side of rack with bolts and nuts. 3.Brake rollers surface should above gravity rollers surface 1-2mm to ensure the speed controlling effect.