Clamp-Aid T Clamp Bolt Covers for 1/4" Diameter Bolts. Package of 20. Color: Black Easily slide over the sharp end of a hose clamp band/T-Bolt Stud protecting you from cuts. Can stretch to accommodate larger marine clamps/bolts. Add a finished and professional look to your work . Can withstand temperatures up to 266 F (average marine and automotive engine compartments rarely exceed 190F). Are made of a flexible strong hi-tech plastic resistant to oils fuels and other chemicals.. Float flat on water. MADE IN THE USA We have Models for 1/2" wide clamp bands T-Bolt clamps and 5/16 wide mini Clamps in 7 colors.