Self-Sealing Machine Screw, Head Type Pan, Material 18-8 Stainless Steel, Length 3/4", Drive Type Phillips, Finish Plain, Thread Size 1/4-20, Driver Size 3, Head Dia. 0.517", Head Height 0.175", Hole Size 0.265 to 0.269", Seal Material Silicone Rubber, Temp. Range (F) -160 to 500, Meets/Exceeds UL and CSA, Package Quantity 5SpecificationFinish : Plain Thread Size : 1/4-20 Driver Size : 3 Head Dia. : 0.517" Head Height : 0.175" WARNING:California ResidentsThis product can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.