Top Secret PDR 13mm or 1/2" Premium RUBBER hole plugs 25 in a pack. These premium plugs fit nicely and give a great finish to your project. Button Plugs with flush-type heads are designed primarily to plug holes in sheet metal. These TSPDR plugs offer greater versatility because of the pliable nature of the material. One size plug fits a variety of different sized holes Quick and easy installation and removal Common applications include car bodies, tanks, appliances, and machinery Manufactured in flexible Santoprene These Plugs are made to fit a properly sized hole in sheet metal or similar Material, Hole Diameter sizes 0.492" - 0.590" OR 12.50mm - 14.00mm and material thickness 0.031" - 0.079" Or 0.80mm - 2.00mm Dimensions Are as follows A 0.315" B 0.905" C 0.590" Material: FlexTemp (Thermoplastic Rubber) Color: Black