Radial Tube Bumper, Free Height: 2.32 in./58.9 mm Length: 18 in./457.2 mm Peak Force: 5,100 lbs./22500 N – Radial Tube Bumpers, RTB are designed for low end-load applications, 1,500 to 42,700 lbs. uniformly loaded the radial tube bumpers are oval in shape and available in 6 to 42 inch lengths. Any application involving shock or collision protection is suitable for using TecsPak Radial Tube Bumpers.